2003 Special issue On the quality of ART1 text clustering
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2021-2022学年广东省深圳市龙岗区平湖中学八年级(上)期中英语试卷一、完形填空(10分)阅读下面短文,从短文后所给的A、B、C、D四个选项中选出能填入相应空白处的最佳选项,并在答题卡上相应的字母涂黑。
(共1小题,每小题10分)1.(10分)I sat with my friend in a well﹣known coffee shop in Italy.As we enjoyed our coffee,a man entered and (1)beside us.He called the waiter and gave his(2)﹣﹣"Two cups of coffee,and put one of them there on the wall."We were(3)in this order very much.We saw him drink one cup of coffee but he paid for two.When he left,the waiter put a piece of paper on the(4)saying"A Cup of Coffee".Then two other men entered and ordered (5)cups of coffee,two on the table and one on the wall.They drank two cups of coffee,but paid for three and left.The waiter did the (6).After a few days,we went to this coffee shop again.A man poorly dressed entered.As he (7),he looked at the wall and said,"One cup of coffee from the wall."The waiter (8)coffee to this man.The man had his coffee and left without paying.Then the waiter wasn't (9).He took off a piece of paper from the wall instead.Now it was very clear.What a (10)thought!Probably it is the most beautiful wall!(1)A.ate B.played C.read D.sat(2)A.hat B.order C.coffee D.tea(3)A.happy B.excited C.interested D.sad(4)A.wall B.table C.floor D.chair(5)A.two B.six C.four D.three(6)A.different B.special ual D.same(7)A.stood up B.sat down C.went into D.left over(8)A.bought B.sold C.gave D.spent(9)A.excited B.relaxed C.interested D.unhappy(10)A.bad B.terrible C.beautiful D.silly二、阅读理解(40分)第一节阅读下列短文,从下面每小题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将相应的字母编号涂黑。
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外贸函电试选择题库Multiple choice1。
Our latest design has won worldwide ________.A. popular B。
popularity C. popularly D。
popularize 2。
Art. No.8905 enjoys the fame of wide ________.A。
selling B。
salable C。
sales D。
sell3. We are unable to satisfy your requirements, for the goods are _______ great demand。
A. inB. onC. of D。
having4. Payment by D/P should be _______ to you.A。
agree B。
agreed C。
agreement D. agreeable 5。
As we are _______ urgent need of Art. No.5609, please ship our order without delay。
A。
on B。
of C。
in D. to6。
We _______ you of our prompt shipment after receipt of your order.A。
assure B. assurance C。
Comprehensive ExercisesUnit1B选择1.The boy acted he didn’t know me.A.so thatB.such asC.as soonD.as if2.I could hardly believe that my son could write this article all himselfA.inB.forC.byD.out of3.There is no reason he should refuse to join us.A.whyB.becauseC.thatD.so that4.Some of these methods will work, but will not.A. B. C. D.5. Respect he held out his hand to greet the old lady.6.It has long been my custom my visitors to some coffee.A.to treatingB.treatingC.treatedD.to treatThey are pulling down the walls of the house.7.The new book has received attention in China and abroadA.considerateB.consideredC.considerableD.considering答案1.D 2.C 3.A 4.D 5.C 6.D 7.A 8.CD翻译1.她很腼腆,不敢在众人面前唱歌〔in public)She is so shy that she dare not sing in public.2.根据作者建议,我们应该入乡随俗。
〔according to)According to the author’s advice,when in Rome we should do as the Romans do.3.那位男士走在一群女士前面以便为她们开门。
硕士研究生英语学位真题2013年12月(总分100,考试时间90分钟)PART Ⅰ LISTENING COMPREHENSIONSection ADirections: In this section, you will hear nine short conversations between two speakers. At the end of each conversation a question will be asked about what was said. The conversations and the questions will be read only once. Choose the best answer from the four choices given by marking the corresponding letter with a single bar across the square brackets on your machine-scored Answer Sheet.【点此下载音频文件】1. A. He broke his leg while shopping. B. He is going to have some food first. C. He can't afford to see the movie. D. He will go to the movie next week.2. A. It should be highly advanced technically. B. It should have technical support all day every day. C. It should have technical support at seven o'clock. D. It should have at least 247 servers.3. A. At a police station. B. At an airport. C. In a restaurant. D. On a farm.4. A. He doesn't care about the CD at all. B. He has already got the CD back. C. Tommy will never return the CD. D. Tommy will return the CD eventually.5. A. It was awesome. B. It was unrealistic. C. It was terrible. D. It was ridiculous.【点此下载音频文件】6. A. He goes skiing very often. B. He doesn't go skiing so often as he used to. C. He rarely goes skiing nowadays. D. He goes skiing once in a while.7. A. He asks the woman to wait till the weekend. B. He can help the woman this weekend. C. He is moving into the woman's apartment. D. He would like the woman to move quickly.8. A. He is a heavy sleeper. B. The clocks won't work. C. He is scared of thunder. D. He is afraid of being late.9. A. To take care of his bag. B. To register for him. C. To go with him. D. To look at his eyes.Section BDirections: In this section you will hear two mini-talks. At the end of each talk, there will be some questions. Both the talks and the questions will be read to you only once. After each question, there will be a pause. During the pause, you must choose the best answer from the four choices given by marking the corresponding letter with a single bar across the square brackets on your machine-scored Answer Sheet.Mini-talk One【点此下载音频文件】1. A. The plum. B. The apple. C. The rose. D. The pear.2. A. Michigan. B. Washington. C. California. D. Oregon.3. A. 35,000. B. 38,000. C. 3,800. D. 3,500.Mini-talk Two【点此下载音频文件】1. A. He is afraid of being abused. B. He can't bear a group situation. C. He is afraid of losing his property. D. He hates being cared for by strangers.2. A. Their children are not willing to help them. B. Their children are too young to help them. C. Their children are busy all the time. D. Their children live far away from them.3. A. Seniors living at home with the help of volunteers. B. Building more nursing homes in the countryside. C. Arranging for older people to live in group situations. D. Encouraging children to live with their aged parents.Section CDirections: In this section you will hear a short lecture. Listen to the recording **plete the notes about the lecture. You will hear the recording twice. After the recording you are asked to write down your answers on the Answer Sheet. You now have 25 seconds to read the notes below.【点此下载音频文件】1. State schools cost less because they get money ______ (3 words) that started them to educate local citizens.2. Out-of-state and international students usually pay more than state residents, ______ (5 words).3. The published tuition at Lewis and Clark is almost ______ (4 words).4. Each year Lewis and Clark University awards ______ (2 words) to twenty students from other countries.5. Prices alone do not say anything about the quality of a school or the ______ (4 words).PART Ⅱ VOCABULARYSection ADirections: There are ten questions in this section. Each question is a sentence with one word or phrase underlined. Below the sentence are four words or phrases marked A, B, C and D. Choose the word or phrase that is closest in meaning to the underlined one. Mark the corresponding letter with a single bar across the square brackets on your machine-scored Answer Sheet.1. Laura Bush still remembers the sentence "the old maid of Midland married Midland's most eligible bachelor."A. desirable B. negligible C. miserable D. affordable2. Timothy **mented that he felt somewhat better following a private meeting with President Obama.A. for some reason B. by large measure C. to some extent D. at any time3. Her sense of humor, her grace and her willingness to bare her heart make this story beautifully rendered.A. told B. advertised C. decorated D. admired4. By the time the general election was over, George felt mentally and physically worn out.A. abused B. exhausted C. enhanced D. depressed5. It is by no means stupid to ask for advice on how to turn down a job offer.A. revise B. negotiate C. seek D. reject6. The two countries are going to sign political agreements that facilitate troop withdrawals.A. help B. demand C. postpone D. induce7. The majority of people living the United States prefer a conventional church wedding.A. luxurious B. traditional C. splendid D. stunning8. Scientists are still measuring the impact of automation on the lives of factory workers.A. benefit B. toll C. agony D. effect9. Andrew had taught English in a couple of schools prior to working in this academy.A.after B. during C. before D. by10. In any city, there are some telephone numbers to call in case of emergency.A. in the course of B. in the event of C. in the middle of D. in the way ofSection BDirections: There are ten questions in this section. Each question is a sentence with something missing. Below each sentence are four words or phrases marked A, B, C and D. Choose one word or phrase that **pletes the sentence. Mark the corresponding letter with a single bar across the square brackets on your machine-scored Answer Sheet.1. This young lady was brave enough to prevent what ______ might have been a tragedy.A. however B. therefore C. otherwise D. only2. When I asked about his son, he did not answer at first, but then he ______ in tears.A. shut down B. let down C. took down D. broke down3. The Arab oil embargo and long gas lines ______ **panies flocking back to Midland.A. compelled B. sent C. delivered D. committed4. Despite the huge progress that has been made, the price of property is far from ______.A. satisfied B. satisfaction C. satisfactory D. satisfy5. I felt good about the debates, believing that my performance had ______ expectations.A. exceeded B. succeeded C. proceeded D. preceded6. It seems a lot of effort but I'm sure it's the best solution ______.A. on the other hand B. in the long run C. once upon a time D. out of the way7. Cherie Blair feels she has a lot to say when asked what she likes ______ her husband.A. from B. in C. to D. about8. Experts offer health ______ as kids will be returning to the classroom this week.A. slips B. tips C. gossips D. clips9. The progress of science depends largely on the interactions within the scientific ______.A. community B. neighborhood C. federation D. integration10. The speed of an object moving in a ______ direction is called the velocity.A. unique B. special C. particular D. strangePART Ⅲ CLOZEDirections: There are 10 questions in this part of the test. Read the passage through. Then, go back and choose one suitable word or phrase marked A, B, C, or D for each blank in the passage. Mark the corresponding letter of the word or phrase you have chosen with a single bar across the square brackets on your machine-scored Answer Sheet.As a society, we're living longer and better than at any time in history. In part, this is due to medical advances. Death rates are down, life 1 is higher than ever, and we're making progress 2 the most serious diseases we face. As we consider the direction health care will 3 in the future, one thing is certain: new, innovative medicines will assume an increasingly 4 role in the way we improve the quality of care for future generations. One 5 role of new medicines will be the prevention, treatment, and management of many diseases suffered by the aging Baby Boomer generation. In the year 2000, there were 6 35.6 million Americans aged 65 and older. By 2030, this number is 7 to double to an estimated 71.5 million. Diseases like diabetes represent a growing threat, 8 to patients but to our ability to keep health care affordable. We have to do better in our lifestyles and in our health care system to 9 an enormous disease burden and economic burden on the Boomers themselves, their families, employers, and federal and state governments. New drugs area vital part of the solution to this rapidly 10 issue.1. A. expression B. expectancy C. exploration D. exploitation2. A. against B. for C. without D. towards3. A. concern B. implement C. address D. take4. A. populous B. prominent C. preliminary D. preferential5. A. crude B. concise C. critical D. capable6. A. roughly B. sincerely C. toughly D. desperately7. A. pronounced B. provided C. prohibited D. projected8. A. except for B. not only C. instead of D. as much9. A. live up to B. lose sight of C. stay clear of D. be stuck in10. A. emerging B. appearing C. booming D. diminishingPART Ⅳ READING COMPREHENSIONDirections: In this part of the test, there are five short passages. Read each passage carefully, and then do the questions that follow. Choose the best answer from the four choices given and mark the corresponding letter with a single bar across the square brackets on your machine-scoredAnswer Sheet.Passage OneLike many writers, I've been kicking around an idea for a novel for years. I wrote part of my tale during a less busy time in my life years ago. But I couldn't build momentum. I'd write a bit, then abandon the project for months.This is a problem many people face, I learned while writing about workday schedules for my recent book. We have grand ideas for where to take our careers someday, but immediate deadlines or meetings or aggressive coworkers always seem to take precedence on Monday morning. Internal motivation is powerful, but it's easier to say no to ourselves rather than the rest of the world.So what do successful people do? They create external motivations for things they want to do but that life has a way of crowding out. They create accountability systems that boost important but not urgent items to the top of their priority lists—ideally in a way that makes failure really uncomfortable.Nika Stewart, for instance, owns a social media marketing business. She's also part of an accountability group called the 7-Figure Club. Every Monday, each entrepreneur checks in online to determine the amount of a week's work that will advance her toward her annual goals. Then on Friday, everyone checks back in to say whether she met her goal. If Stewart's weekly goal, shared with the group on Monday, was to send out 10 proposals, she tells me, "Thursday night, if I didn't do it, I might stay up and do it." Why? She doesn't want to look lazy to people whose opinion she cares about.I knew I needed an accountability system for myself, or my novel would never get written. Late last year, I found my partner Katherine Reynolds Lewis. I'm almost embarrassed to say how effective this little shift in approach was. Being accountable to Katherine made me want to write 2,000 words, just so I could e-mail her saying I'd written them. There weren't any real consequences to failing, but the part of my brain that learned to turn in papers on time in school years ago leapt to attention once it had an assignment."Write 2,000 words" got a spot on my to-do list. In 10 weeks, I had enough words (20,000) to have a sense of how I intended to shape the second half of the book. By April 15,! had my draft. 1. In Paragraph 1, "build momentum" refers to ______.A. find enough time for writing B. form a good habit of writing C. keep on writing my novel D. decide on the plot of my novel2. What is the problem mentioned in Paragraph 2?A. Lack of internal motivation. B. Limited time and energy. C. Competition among coworkers. D. Over-demanding job responsibility.3. The accountability system can help people ______.A. create an internal motivation to do important things B. accomplish what they have promised to do C. determine what are the important things to do D. succeed in doing things they don't want to do4. Nika Stewart makes sure that she meets her goals ______.A. by winning friends' support B. by staying up each day C. through **munication D. through group pressure5. What can we say about the effect of the accountability system on the author?A. Very disappointing. B. Hard to say for now. C. Kind of promising. D. Quite successful.6. What is the main idea of the passage?A. How does the accountability system work? B. Who is going to join the accountability system? C. When is the accountability system most effective? D. Why are people interested in the accountability system?Passage TwoThe tomatoes your great-grandparents ate probably tasted little like the ones you eat today. In fact, tomatoes "were once so flavorful that you could take one in your hand and eat it straight away just like we regularly eat apples or peaches," according to plant scientist Alan Bennett. He belongs to a team of international scientists who now think they know one reason why the fruit has lost so much flavor.Although some unripe tomatoes have a dark green patch near the stem, farmers prefer that their unripe tomatoes are the same shade of green all over. The consistent coloring makes it easier for them to know when the fruit should be picked.But tomatoes without the dark green patch are also missing an important genetic ingredient that helps the fruit make more sugar and other tasty molecules. So by breeding tomatoes for that consistent color, Bennett's team says, crop scientists may have accidentally contributed to also making this fruit bland. "It is a good illustration of unintended consequences," Harry Klee told Science News.Tomatoes make sugars in compartments called chloroplasts (叶绿体). Bennett and his colleagues found that tomatoes need the correct version of a gene (one called S1GLK2) to form chloroplasts properly in the fruit. A gene acts as a biological instruction book that tells cells which molecules to make.Tomatoes without the dark green patch have the wrong version of this gene, the researchers report in Science. As these fruits ripen, they can't make as many chloroplasts. And chloroplasts that they do produce are smaller. One result: The tomatoes make less sugar—and don't taste as good.Tomatoes also produce gases responsible for some of the odors we associate with the fruit. Even though you only breathe them, these gases affect the way that you perceive flavor. Tomatoes with weak chloroplasts can't make as much of these gases, further reducing flavor.But the newfound gene change is "not the whole story of why modern tomatoes are so bad, by a long shot," Klee told Science News. Tomatoes are also blander when they are picked too early or stored in the fridge.1. Which of the following results from the help of crop scientists?A. Tomatoes with various colors. B. Improved color and taste of tomatoes. C. Increased output of tomatoes. D. Tomatoes with a consistent green color.2. The word "bland" (Para. 3) probably means ______.A. less nutritious B. less tasteful C. more colorful D. more productive3. What does Harry Klee think of the work of crop scientists?A. It is a mixed blessing. B. It is beneficial to farming. C. It is hard to evaluate. D. It does more good than harm.4. What can be learned about chloroplasts?A. The more the chloroplasts, the sweeter the tomatoes. B. The smaller the chloroplasts, the better odor tomatoes have. C. Chloroplasts help form the correct version of S1GLK2. D. Chloroplasts mainly affect tomatoes' color, not their flavor.5. Which of the following is NOT mentioned as a reason for tomatoes' flavor today?A. The change of tomatoes' gene. B. The time tomatoes are picked. C. The soil where tomatoes are planted. D. The storage temperature.6. The passage is mainly written to ______.A. introduce the modern way of breeding tomatoes B. compare tomatoes today and those in the past C. describe how the tomato technology has evolved D. explain why tomatoes today have lost much flavorPassage ThreeRecently, I was struck by Eric Holder's comment on the George Zimmerman versus Trayvon Martin case in Florida. Talking about his son and the fears of African-American fathers for their teenage sons, Holder said: "I am his father and it is my responsibility, not to burden him with the baggage of eras long gone, but to make him aware of the world he must still confront. This is a sad reality in a nation that is changing for the better in so many ways."I also agree with **mentary of Lawrence Bobo:"The most essential facts of this case will never change. A teenager went out to buy iced tea. At some point, he was confronted by a man with a gun who killed him. There is no universe I understand where this can be declared a noncriminal act. Not in a sound, just and racism-free universe."What happened was a crime and the released shooter, Zimmerman, is no role model for anyone. He was aggressively stupid.But for me, the mentally-retarded killer is not the issue. I think this story is about guns and television. Florida is a swampy place and so are its laws. It is absurd to permit a civilian like Zimmerman to legally go around with a concealed weapon, following or pursuing anyone he decides or imagines is a danger to **munity. Circumstances like that are the reason we have laws, courts and police.And television. I know a bit about television in courtrooms, which I thought was a bad idea from the start. In 1978, I wrote about what I believe was the first televised trial—in Miami. The defendant was a kid named Ronny Zamora, who killed an 83-year-old neighbor in an unskilled burglary in her home. He was sentenced to life imprisonment.The Zamora case, like the Zimmerman case, was a big story, not because it was an unusual trial, but because of cameras in the courtroom. The television press could not ignore it. The video feed was a real reality show. It was irresistible and dangerous television wallpaper, guaranteed to fan the ever-withering racial coals of the nation.Back to guns. My father was for gun control because, as he told me many times, in disputes that escalate into violence, someone inevitably reaches for the deadliest weapon available. If there's a gun and someone uses it, death is likely. He was right, then and now.1. According to Paragraph One, Eric Holder is probably ______.A. reluctant to face the real world B. disappointed with some social realities C. indifferent to racial discrimination D. confident about the future of this country2. Lawrence Bobo's comment reveals his ______.A. sympathy for Zimmerman B. tolerance of street violence C. intense anger at the verdict D. doubt about the evidence3. In Paragraph Five, the author is ______.A. criticizing local laws in Florida B. praising Florida for its legislation C. arguing for death penalty in Florida D. defending the killer Zimmerman4. Television is blamed for its ______.A. distorted presentation of court trials B. constant exaggeration of the crime rate C. prejudice against the colored people D. negative effect on racial issues5. The author agrees with his father in that ______.A. guns have nothing to do with crime B. guns can effectively prevent crime C. guns can serve as deadly weapons D. guns should not be controlled6. Which of the following can best serve as the title of this passage?A. A Big Tragedy and a Big Story: Race, Guns & Television B. Gun Control: Both a Blessing and a Curse C. What Is to Be Done to Prevent Illegal Shooting D. The Role of Television in Fair TrialsPassage FourForecasting the weather requires huge quantities of data, mainly collected by high-tech means such as satellites and radar, but low-tech tools are important too—especially old-fashioned rain gauges (雨量器).Each technique has its strengths and weaknesses. Radar and satellites can cover swathes of land, yet they lack detail. Gauges are much more accurate, but the price of that accuracy is spotty coverage. Now, though, Aart Overeem of the Royal Netherlands Meteorological Institute and his colleagues reckon they **e up with another way to watch the rain carefully. It offers, they believe, both broad coverage and fine detail. Best of all, it relies on something that is already almost everywhere—the mobile-phone network.Their scheme starts from the observation that rain can make it harder for certain sorts of electromagnetic radiation to travel through the atmosphere. Measure this resistance and you can measure how rainy it is. The researchers do not measure the strength of mobile-phone signals themselves. Instead, they rely on something that mobile networks already do, and measure the strength of the microwave links that base stations use to talk to each other.The idea itself is not new, and there have been trials in recent years. Like all the best science, the idea is both technically elegant and practically useful, since it allows better cross-checking ofexisting methods. There are other advantages. Coverage is one. Even in rich countries with well-financed weather forecasters, there are probably far more mobile-phone base stations than rain gauges. That is truer still in poor countries, where rain gauges are scarce and radar often nonexistent, but mobile **mon. Another boon is that network operators tend to keep a close eye on their microwave links. Although the researchers were able to obtain data only every 15 minutes, some firms sample their networks once a minute. That means rainfall could, in principle, be measured almost in real time, something that neither gauges nor radar nor satellites can manage.The technology is not perfect: snow and hail are harder than rain for microwaves to spot, for example. Besides, mobile networks are densest in urban areas, which are also the places that probably have weather-forecasting equipment already. Even in the rich, urbanized Netherlands, coverage outside cities is noticeably irregular.1. Paragraph 3 mainly talks about ______.A. how to use the mobile-phone network to measure rainfall B. the equipment for measuring rainfall with the mobile-phone network C. the limits of using the mobile-phone network to measure rainfall D. the efficiency of measuring rainfall with the mobile-phone network2. What is true about the idea of using the mobile-phone network to measure rain?A. It is completely new. B. It is a bit impractical. C. It is worth a try. D. It is easier said than done.3. What does the word "boon" (Paragraph 4) probably mean?A. A problem. B. A flaw. C.A theory. D. A benefit.4. The mobile-phone network has advantages over both satellites and gauges because ______.A. it is easy to use B. it offers real-time measurement C. it is less expensive D. it is more accurate5. One of the problems with this new technology is that ______.A. mobile phones are rarely used in rural areas B. weather forecasts are not easy in big cities C. some areas can't be adequately covered D. this technology can hardly be used m poor countries6. The purpose of writing the passage is to ______.A. introduce a new way of forecasting the weather B. compare the existing ways of forecasting the weather C. point out the need for improvement in weather forecast D. analyze the technological development in weather forecastPassage FiveOh no, not Anthony Weiner again.The older generation never gets it. Anthony Weiner, a candidate for mayor of New York, admitted this week to having sent more snaps of himself to a digital acquaintance. As any youngster could have told him, the way to find love is to send photos of your face.Consider Will, a 24-year-old future film director in California. He meets potential dates via a smartphone app called Tinder. It finds potential matches who are nearby—your phone alwaysknows where you are—and shows him photos from their Facebook profiles. Will can like or reject each photo. If a woman he likes also likes him, both are alerted and can start chatting.Tinder is quick (you can look through dozens of photos in minutes) and spares your blushes (you never know if someone rejects you). Will has already had three romantic encounters and hundreds of matches, he says. Justin Mateen, a co-founder of Tinder, says it has made 100m matches since its launch in September, and led to 50 marriage proposals. He adds: "The app has only really been going for nine months. There could be a baby popping out soon."Americans are dating longer, which creates opportunities for matchmakers. Some are quite direct.Bang with Friends (BWF), another app, allows users to specify which of their Facebook friends they would like to spend the night with. If both parties feel the same way, BWF notifies them. If not, no one is any wiser. BWF was booted from Apple's app store, but that hasn't stopped it from creating 200,000 pairings since its January launch. BWF's boss admits he came up with the concept while "a bit drunk."Such apps make it easier to find potential partners, but don't seem to have turned America into a nation of bed-hoppers. Young women claim to have had an average of 3.6 male intimate friends while young men 6.1 female ones. These figures may be inaccurate—men may exaggerate; women may undercount—but they have not changed much in years.Parents worry that staring at screens all day has made youngsters socially awkward face-to-face. A survey by two dating sites found that 36%-38% of Americans aged 21-34 ask for dates by text message. But when they meet, they must still make their moves in person. Witty joking and a well-placed facial expression still have their uses.1. It can be summarized from the first three paragraphs that ______.A. we used to judge a potential match by his or her appearance B. one can find love by sending his photos to a digital acquaintance C. Anthony Weiner is trying to win more votes from digital friends D. Tinder will probably replace traditional matchmakers worldwide2. The underlined sentence in Paragraph 4 probably means that ______.A. babies may send photos to each other via a smartphone B. babies will appear in advertisements about cell phones C. Tinder can possibly lead to marriages and baby births D. parents usually send digital photos of their baby to friends3. Paragraph 6 is focused on ______.A. the huge success that BWF has achieved B. the serious consequence of digital dating C. the evolution of matchmaking in the U.S. D. the future developments of Facebook4. The last paragraph implies that ______.A. excessive use of apps leaves youngsters socially awkward B. most young people find love through text messages C. people in love often move their homes before marriage D. verbal or non-verbal language is still used during dates5. Potential matches found by Tinder are probably ______.A. young, single and nearby B. poor, married but lonely C. illiterate, retired but divorced D. far-away, busy and happy6. This passage is primarily concerned with ______.A. novel cell phones B.。
北京市朝阳区2023-2024学年高三上学期期末质量检测英语模拟试卷第一部分知识运用(共两节, 30分)第一节(共10小题;每小题1. 5分, 共15分)阅读下面短文, 掌握其大意, 从每题所给的A、B、C、D四个选项中, 选出最佳选项, 并在答题卡上将该项涂黑。
Gardening changed how I see myself as a disabled woman. When I started gardening in 2018, I didn't know anything about plants, let alone how to grow things we can eat. I thought gardening required a lot of 1 tasks. As I have a genetic (遗传的) condition that causes my bones to 2 easily, I didn't believe I could complete them. The thought of taking care of plants in a wheelchair every day made me feel 3 . But just like how I gradually learnt everything else as a disabled person, I had to 4 how to garden my way.That first season, I visited my garden as much as I could. Noticing my interest in gardening, my neighbors in the community 5 offered me advice and support. Under their careful 6 , I managed to pull up the weeds and watered my plants on my own. Finally, I was so proud to eat the tomatoes I grew and even shared some with neighbors. They tasted like summertime.Gardening has 7 how I see other parts of my life. As a disabled woman, I fear being seen as a 8 and struggle to ask for the things I need. Gardening helped me normalize the fact that I have needs. I don't think my plant is a heavy load because it needs more nutrition. I don't 9 it for getting insects and not being able to fight against them. Gardening also helped me expand my social circle and grow close to people in our community.Over the years, gardening has made me feel more confident in every aspect of my life. I'm planting what I want to grow, and I have gained a lot of 10 from that.1. A. simple B. physical C. pleasant D. urgent2. A. change B. rest C. break D. move3. A. anxious B. expectant C. motivated D. bored4. A. look over B. show off C. bring back D. figure out5. A. suddenly B. readily C. hesitantly D. casually6. A. observation B. check C. discussion D. guidance7. A. impacted B. ruined C. controlled D. recorded8. A. support B. comfort C. burden D. threat9. A. appreciate B. fault C. challenge D. forgive10. A. justice B. access C. weight D. power第二节(共10小题;每小题1. 5分, 共15分)阅读下列短文, 根据短文内容填空。
新文科概念的英文资料1. New Humanities: Rethinking the Role of the Humanities in the Digital Age (book)This book explores the concept of "new humanities" and how the traditional study of humanities needs to adapt to the digital age. It discusses the integration of technology, data analysis, and interdisciplinary approaches in the study of humanities.2. The Emergence of New Humanities: A Manifesto (journal article)In this manifesto, the author argues for the emergence of "new humanities" as a response to the changing academic landscape. It emphasizes the importance of collaboration, community engagement, and public scholarship in the study of humanities.3. The Digital Humanities: A Primer for Students and Scholars (book) This book provides an introduction to the field of digital humanities, which is considered a subfield of the new humanities. It explores how digital tools and technologies can be used to analyze and interpret cultural artifacts, literature, and historical data.4. The New Humanities: A Pedagogical Approach (journal article)This article proposes a pedagogical approach to teaching the newhumanities, focusing on experiential learning, critical thinking, and problem-solving skills. It argues for the integration of technology, interdisciplinary studies, and community-based projects in humanities education.5. New Directions in the Humanities (academic conference proceedings) This collection of conference proceedings features research papers and presentations on various topics related to the new humanities. It covers areas such as digital storytelling, data visualization, cultural heritage preservation, and collaborative research methodologies.6. The Future of the Humanities in a Globalized World (book chapter) This book chapter discusses the future of humanities studies in the context of globalization. It highlights the need for scholars to engage with diverse cultural perspectives, address global challenges, and embrace interdisciplinary approaches in their research.7. The Digital Turn: New Directions in the Humanities (edited volume) This edited volume brings together a collection of essays that explore the impact of digital technologies on humanities studies. It covers topics such as digital archives, spatial humanities, computational linguistics, and virtual reality in the humanities.8. The Relevance of the Humanities in the 21st Century (blog post)In this blog post, the author reflects on the relevance of humanities in the 21st century and how the field needs to adapt to changing societal needs. It discusses the integration of technology, social justice issues, and interdisciplinary studies in the new humanities.9. The New Humanities: Exploring Interdisciplinary Approaches (journal special issue)This special issue of a journal features research articles on interdisciplinary approaches in the new humanities. It includes case studies, theoretical discussions, and methodological reflections on topics such as digital storytelling, environmental humanities, and postcolonial studies.10. Reimagining the Humanities: New Methods, New Audiences, New Possibilities (conference presentation slides)These presentation slides from an academic conference discuss the reimagining of humanities studies in the digital age. It explores innovative research methods, audience engagement strategies, and the potential of artificial intelligence in the humanities.。
An Approach to Environmental Protection Environmental protection is a critical issue that concerns us all. The quality of the environment, including the air we breathe, the water we drink, and the Earth we walk on, is important for our health and well-being. The rapid industrialization and urbanization have led to a severe environmental crisis, which affects not only the present but also the future generations. Therefore, it is necessary to take measures and adopt strategies to protect the environment and preserve its quality.One major approach to environmental protection is to reduce the use of non-renewable resources. Non-renewable resources, such as oil, coal and natural gas, are finite and will eventually run out. The extraction and use of these resources have negative impacts on the environment, including air and water pollution, soil degradation and climate change. Therefore, we need to find alternative sources of energy that are renewable, such as solar, wind and water energy. These sources are clean and do not emit greenhouse gases that contribute to climate change. By switching to renewable energy, we can reduce our dependence on non-renewable resources and promote sustainable development.Another approach to environmental protection is to reduce waste. Waste, including household waste, industrial waste and electronic waste, is a significant source of environmental pollution. It can cause water and air pollution, soil contamination, and harm to wildlife. Therefore, we need to adopt practices that reduce waste and promote recycling and reusing. For example, we can reduce waste by using canvas bags instead of plastic bags, buying products with minimal packaging, and composting biodegradable waste. Recycling and reusing, such as recycling paper, glass, and electronics, can save resources and reduce waste.In addition to reducing non-renewable resources and waste, we need to protect natural habitats and biodiversity. Natural habitats, including forests, wetlands, and oceans, are essential for maintaining biodiversity and regulating the Earth’s cl imate. Biodiversity, the variety of life on Earth, provides us with various ecological services, including clean water, air, and soil. However, human activities, such as deforestation, overfishing, and oil extraction, have resulted in the loss of natural habitats and biodiversity. Therefore, we need to protect natural habitats by adopting sustainable land use practices, such as afforestation and conservation of wetlands and oceans. We also need to protect endangered species and promote the restoration of degraded ecosystems.To sum up, environmental protection is crucial for our health and well-being, and several measures are necessary to protect the environment. We need to reduce our dependence on non-renewable resources, reduce waste, protect natural habitats and biodiversity, and promote sustainable development. If we adopt these measures and strategies, we can ensure a sustainable future for ourselves and the generations to come.。
英语专八试卷真题及答案 Revised final draft November 26, 20202004年英语专八试卷真题及答案PART Ⅰ LISTENING COMPREHENSIONSECTION A TALKLanguage is used for doing things. People use it in everyday conversation for transacting business, planning meals and vacations, debating politics, and gossiping. Teachers use it for instructing students, and comedians use it for amusing audiences. All these are instances of language use - that is activities in which people do things with language. As we can see, language use is really a form of joint action.What is joint action I think it is an action that is carried out by a group of people doing things in coordination with each other. As simple examples, think of two people waltzing, or playing a piano duet. When two dancers waltz, they each move around the ballroom in a special way. But waltzing is different from the sum of their individual actions. Can you imagine these two dancers doing the same steps, but in separate rooms, or at separate times So waltzing is, in fact, the joint action that emerges as the two dancers do their individual steps in coordination, as a couple.Similarly, doing things with language is also different from the sum of the speaker speaking and the listener listening. It is the joint action that emerges when speakers and listeners, or writers and readers, perform their individual actions in coordination, as ensembles. Therefore, we can say that language use incorporates bothindividual and social processes. Speakers and listeners, writers and readers, must carry out actions as individuals, if they are to succeed in their use of language. But they must also work together as participants in the social units I have called ensembles. In the example I mentioned just now, the two dancers perform both individual actions, moving their bodies, arms, and legs, and joint actions, coordinating these movements, as they create the waltz. In the past, language use has been studied as if it were entirely an individual process. And it has also been studied as if it were entirely a social process. For me, I suggest that it belongs to both. We cannot hope to understand language use without viewing it as joint actions built on individual actions. In order to explain how all these actions work,I'd like to review briefly settings of language use. By settings, I mean the scene in which language use takes place, plus the medium - which refers to whether language use is spoken or written. And inthis talk, I'll focus on spoken settings.The spoken setting mentioned most often is conversation - either face to face, or on the telephone. Conversations may be devoted to gossip, business transactions or scientific matters, but they're all characterized by the free exchange of terms among the two participants. I'll call these personal settings. Then we have what I would call nonpersonal settings. A typical example is the monologue.In monologues, one person speaks with little or no opportunity for interruption, or turns by members of the audience. Monologues come in many varieties too, as a professor lectures to a class, or a student giving a presentation to a seminar. These people speak for themselves, uttering words they formulated themselves for the audience before them, and the audience isn't expected to interrupt. In another kindof setting which are called institutional settings, the participantsengage in speech exchanges that look like ordinary conversation, but they are limited by institutional rules. As examples, we can think of a government official holding a news conference, a lawyercross questioning a witness in court, or a professor directing a seminar discussion. In these settings, what is said is more or less spontaneous, even though turns at speaking are allocated by a leader, or are restricted in other ways.The person speaking isn't always the one whose intentions are being expressed. We have the clearest examples in fictional settings. Vivian Leigh plays Scarlett O'Hara in "Gone with the Wind", Frank Sinatra sings a love song in front of a live audience, the speakers are each vocalizing words composed by someone else - for instance a playwright or a composer - and are openly pretending to be expressing opinions that aren't necessarily their own. Finally there are private settings when people speak for themselves without actually addressing anyone else, for example, I might explain silently to myself, or talk to myself about solving a research problem, or rehearsing what I'm about to say in a seminar tomorrow. What I say isn't intended to be recognized by other people, it is only of use to myself. These are the features of private settings.SECTION B TALKW: Good evening, I'm Nancy Johnson. The guest on our radio talk this evening is Professor Wang Gongwu. Hello, Professor Wang.M: Hello.W: Professor Wang, you're now professor emeritus of Australia National University, and in your long academic career, you've wornmany hats as tutor, lecturer, department head, dean, professor, and vice chancellor. However, as I know, you're still very fond of your university days as a student.M: That's right. That was in 1949. The university that I went to was a brand new university then, and the only one in the country at that time. When I look back, it was an amazingly small university, and we knew everybody.W: How did the students like you, for example, study thenM: We didn't study very hard, because we didn't have to. We didn't have all this fantastic competition that you have today. Mmm. We were always made to feel that getting a first degree in the Arts faculty was not preparation for a profession. It was a general education. We were not under any pressure to decide on our careers, and we had such a good time. We were left very much on our own, and we were encouraged to make things happen.W: What do you see as the most striking difference in university education since thenM: University education has changed dramatically since those days. Things are very specialized today.W: Yes, definitely so. And, in your subsequent career experience as an educator and later administrator in various institutions of higher education in Asia and elsewhere, Professor Wang, you have repeatedlynoted that one has to look at the development of education in one particular country in a broad context. What do you mean by thatM: Well, the whole world has moved away from elite education in universities to meet the needs of mass education, and entering universities is no longer a privilege for the few. And universities today are more concerned with providing jobs for their graduates in a way that universities in our time never had to be bothered about. Therefore, the emphasis of university programs today is now on the practical and the utilitarian, rather than on a general education or on personal development.W: Do you think that is a welcome developmentM: Well, I personally regret this development. But the basicbachelor's education now has to cater to people who really need a piece of paper to find a decent job.W: So you're concerned about this development.M: Yes, I'm very concerned. With technical changes, many of the things that you learn are technical skills, which don't require you to become very well educated. Yet, if you can master those skills, you can get very good jobs. So the technical institutions are going to be increasingly popular at the expense of traditional universitites.W: Professor Wang, let's look at a different issue. How do you comment on the current phenomenon because of the fees they payM: Well, once you accept students on financial grounds, one wonders whether you have to pass them as well. But this is the development in education that we have to contend with. Yet, if we are concerned about maintaining standards, what we can do is to concentrate on improving the quality of education.W: Yes, you're right. A university is judged by the quality of education it offers. Professor Wang, let's turn to the future. What type of graduates, in your view, to universities of the future need to produce, if they are to remain relevantM: I think their graduates must be able to shift from one profession to another, because they are trained in a very independent way. If you can do that, you raise the level of the flexibility of the mind. Today's rapid changes in technology demand this adaptability. And you see the best universities in the world are already trying to guarantee that their students will not only be technically trained, but will be the kind of people that can adapt to any changing situation.W: I guess many people would agree with you on that point. University education should focus on both personal and professional development of students. But still some might believe there is a definite place for education in a broader sense - that is, in personal intellectual development.M: No doubt about that. We need people who will think about the future, about the past, and also people who will think about society.If a society doesn't have philosophers, or people who think about the value of life, it's a very sad society indeed.W: Professor Wang, my last question: do you see any common ground in education between your generation and the young generation nowM: Adapting to new challenges is perhaps the true cornerstone of our generation's legacy to education. And the future of education in a country rests not so much on the construction of better buildings, labs, etc., but in the development of an ever adaptable mind.W:That's true. The essence of education is the education of the mind. Okay, thank you very much, Professor Wang, for talking to us on the show about the changing trends in education.M: You're welcomeSECTION CA new data shows that the global AIDS pandemic will cause a sharp drop in life expectancy in dozens of countries, in some cases, declines of three decades. Several nations are losing a century's progress in extending the length of life. Nations in every part of the world, 51 in all, are suffering declining life expectancies because of an increasing prevalence of HIV infection. The increase is occurring in Asia, Latin America, and the Carribbean, but is greatest in sub Saharan Africa, a region with only 10% of the world's population but 70% of the world's HIV infections. Seven African countries have life expectancies of less than 40 years. For example, in Botswana, where 39% of the adult population is infected with HIV,life expectancy is 39 years. But by 2010, it will be less than 27 years. Without AIDS, it would have been 44 years. Life expectancy throughout the Carribbean and some Central American nations will drop into the 60's by 2010, when they would otherwise have been in the70's without AIDS. In Cambodia and Burma, they are predicted to decline to around 60 years old, to what otherwise would have been in the mid 60's. Even in countries where the number of new infections is dropping, such as Thailand, Uganda, and Senegal, small life expectancy drop is forecast. Back in the early 1990's, we never would have suspected that population growth would have turned negative because of AIDS mortality. In less than 10 years, we expect that 5 countries will be experiencing negative population growth because of AIDS mortality, including South Africa, Mozambique, Lesotho, Botswana and Swaziland.Questions 14 and 15 are based on the following news. At the end of the news item, you will be given 30 seconds to answer the questions. Now listen to the news.The European Union has drafted alist of US products to be hit with import taxes in retaliation for tariffs the United States has imposed on European steel. EU member governments will review the list before the EU submits it to the World Trade Organization, which arbitrates international trade disputes. EU officials will not say which American products will be hit by the EU sanctions. But diplomats monitoring the most recent trans Atlantic trade dispute say they include textiles and steel products.Earlier this month, the Bush administration imposed tariffs of up to 30 percent on some steel imports, including European products.The EU has appealed to the World Trade Organization to get those duties overturned. But a WTO decision on the matter could take up to a year or more. EU officials say that, under WTO rules, the EU has the right to impose retaliatory measures in June. But they saythe United States can avoid the EU's possible countermeasures if it pays more than two billion dollars in compensation to the EU for imposing the steel tariffs in the first place. The officials say Washington could also escape retaliation by lowering U.S. import duties on other EU products. The Bush administration says it will not pay compensation.SECTION D TALKGood morning. Today's lecture will focus on how to make people feel at ease in conversations. I guessall of you sitting here can recall certain people who just seem to make you feel comfortable when they are around. You spend an hour with them and feel as if you've known them half your life. These people who have that certain something that makes us feel comfortable have something in common, and once we know what that is, we can go about getting some of that something for ourselves. How is it done Here are some of the skills that good talkers have. If you follow the skills, they will help you put people at their ease, make them feel secure, and comfortable, and turn acquaintances into friends. First of all, good talkers ask questions. Almost anyone, no matter how shy, will answer a question. In fact, according to my observation, very shy persons are often more willing to answer questions than extroverts. They are more concerned that someone will think them impolite if they don't respond to the questions. So most skillful conversationalists recommend starting with a question that is personal, but not harmful. For example, once a famous American TV presenter got a long and fascinating interview from a notoriously private billionaire by asking him about his first job. Another example, one prominent woman executive confesses that at business lunches, "I always ask people what they did that morning. It's a dull question, but it gets things going." From there, you can move on to other matters, sometimes to really personal questions. Moreover, howyour responder answers will let you know how far you can go. A few simple catchwords like "Really" "Yes" are clear invitations to continue talking. Second, once good talkers have asked questions,they listen for answers. This point seems obvious, but it isn't in fact. Making people feel comfortable isn't simply a matter of making idle conversation. Your questions have a point. You're really asking, "What sort of person are you" and to find out, you have to really listen. There are at least three components of real listening. Forone thing, real listening means not changing the subject. If someone sticks to one topic, you can assume that he or she is reallyinterested in it. Another component of real listening is listeningnot just to words but to tones of voice. I once mentioned D.H. Lawrence to a friend. To my astonishment, she launched into an academic discussion of the imagery in Lawrence's works. Midway through, I listened to her voice. It was, to put it mildly, unanimated, and it seemed obvious that the imagery monologue was intended solely for my benefit, and I quickly changed the subject. At last, real listening means using your eyes as well as your ears. When your gaze wanders, it makes people think they're boring your, or what they are saying is not interesting. Of course, you don't have to stare, or glare at them. Simply looking attentive will make most people think that you think they're fascinating. Next, good talkers are not afraid to laugh. If you think of all the people you know who make you feel comfortable, you may notice that all of them laugh a lot. Laughter is not only warming and friendly, it's also a good wayto ease other people's discomfort. I have a friend who might enjoy watching at gathering of other people who do not know each other well. The first few minutes of talk are a bit uneasy and hesitant, for the people involved do not yet have a sense of each other. Invariably, alight comment or joke is made, and my friend's easy laughter appears like sunshine in the conversation. There is always then a visible softening that takes place. Other people smile, and loosen in response to her laughter, and the conversation goes on with more warmth and ease.Finally, good talkers are onces who cement a parting. That is, they know how to make use of parting as a way to leave adeep impression on others. Last impressions are just as important as first impressions in determining how a new acquaintance will remember you. People who make others really feel comfortable take advantage of that parting moment to close the deal. Men have had it easier. They have done it with a smile, and a good firm handshake. What about women then Over the last several years, women have started to take over that custom well between themselves or with men. If you'resaying goodbye, you might want to give him or her a second extra hand squeeze. It's a way to say, I really enjoyed meeting you. But it'snot all done with body language. If you've enjoyed being with someone, if you want to see that person again, don't keep it a secret. Let people know how you feel, and they may walk away feeling as ifthey've known you half their life. Okay, just to sum up. Today, we've talked about four ways to make people feel at ease in conversations. These skills are important in keeping conversations going, and in forming friendships later on. Of course, these skills are by no means the only ones we can use. the list is much longer. I hope you willuse these four skills, and discover more on your own in your conversations with other people. Now you have two minutes to check your notes, and then please complete the 15 minute gap filling taskon Answer Sheet One.This is the end of listening comprehension.试题Part Ⅰ Listening Comprehension (40 min)In Sections A,B and C you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Mark the correct answer to each question on your colored answer sheet.SECTION A TALKQuestions 1 to 5 refer to the talk in this section. At the end of the talk you will be given 75 seconds to answer the questions. Now listen to the talk.1. The parallel between waltzing and language use lies in ____.A. the coordination based on individual actionsB. the number of individual participantsC. the necessity of individual actionsD. the requirements for participants2. In the talk the speaker thinks that language use is a(n) ____ process.A. individualB. combinedC. distinctD. social3. The main difference between personal and non-personal settings is in ____.A. the manner of language useB. the topic and content of speechC. the interactions between speaker and audienceD. the relationship between speaker and audience4. In fictional settings, speakers ____.A. hide their real intentionsB. voice others' intentionsC. play double roles on and off stageD. only imitate other people in life5. Compared with other types of settings, the main feature of private setting is ____.A. the absence of spontaneityB. the presence of individual actionsC. the lack of real intentionsD. the absence of audienceSECTION B INTERVIEWQuestions 6 to 10 are based on an interview. At the end of the interview you will be given 75 seconds to answer the questions. Now listen to the interview.6. What was education like in Professor Wang's daysA. Students worked very hard.B. Students felt they needed a second degree.C. Education was not career-oriented.D. There were many specialized subjects.7. According to Professor Wang, what is the purpose of the present-day educationA. To turn out an adequate number of elite for the society.B. To prepare students for their future career.C. To offer practical and utilitarian courses in each programme.D. To set up as many technical institutions as possible.8. In Professor Wang's opinion, technical skills ____.A. require good educationB. are secondary to educationC. don't call for good educationD. don't conflict with education9. What does Professor Wang suggest to cope with the situation caused by increasing numbers of fee-paying studentsA. Shifting from one programme to another.B. Working out ways to reduce student number.C. Emphasizing better quality of education.D. Setting up stricter examination standards.10. Future education needs to produce graduates of all the following categories EXCEPT ____.A. those who can adapt to different professionsB. those who have a high flexibility of mindC. those who are thinkers, historians and philosophersD. those who possess only highly specialized skillsSECTION C NEWS BROADCASTQuestions 11 to 13 are based on the following news. At the end of the news item, you will be given 45 seconds to answer the questions. Now listen to the news.11. Which of the following regions in the world will witness the sharpest drop in life expectancyA. Latin America.B. Sub Saharan Africa.C. Asia.D. The Caribbean.12. According to the news, which country will experience small life expectancy dropA. Burma.B. Botswana.C. Cambodia.D. Thailand.13. The countries that are predicted to experience negative population growth are mainly in ____ .A. Asia.B. Africa.C. Latin America.D. The Caribbean.Questions 14 and 15 are based on the following news. At the end of the news item, you will be given 30 seconds to answer the questions. Now listen to the news.14. The trade dispute between the European Union and the US was caused by ____. refusal to accept arbitration by WTO imposing tariffs on European steel refusal to pay compensation to EU refusal to lower import duties on EU products15. Who will be consulted first before the EU list is submitted to WTOA. EU member states.B. The United States.C. WTO.D. The steel corporations.SECTION D NOTE-TAKING AND GAP-FILLINGIn this section you will hear a mini-lecture ONCE ONLY. While listening to the lecture, take notes on the important points. Your notes will not be marked, but you will need them to complete a 15-minute gap-filling task on ANSWER SHEET ONE after the mini-lecture. Use the blank paper for note-taking. Fill in each of the gaps with one word. You may refer to your notes. Make sure the word you fill in is both grammatically and semantically acceptable.Conversation SkillsPeople who usually make us feel comfortable in conversations are good talkers. And they have something in common, i.e. skills to put people at ease.1. Skill to ask question1) be aware of the human nature: readiness to answer other's questions regardless of (1)____2) start a conversation with some personal but unharmful questions about one's (2)____ job.questions about one's activities in the (3)____3) be able to spot signals for further talk2. Skill to (4)____for answers1) don't shift from subject to subject-sticking to the same subject: signs of (5)____in conversation.2) listen to (6)____of voice - If people sound unenthusiastic, then change subject.3) use eyes and ears - steady your gaze while listening3. Skill to laughEffects of laughter:- ease people's (7)____- help start (8)____4. Skill to part1) importance: open up possibilities for future friendship or contact2) ways:- men: a smile, a (9)____- women: same as (10)____ now- how to express pleasure in meeting someone.(1) ______ (2) ______ (3) ______ (4) ______ ( 5 ) ______(6) ______ (7) ______ (8) ______ (9) ______ (10) ______PART II PROOFREADING AND ERROR CORRECTION (15 MIN)The following passage contains TEN errors. Each line contains a maximum of one error and three are free from error. In each case, only one word is involved. You should proofread the passage and correct it in the following way.For a wrong word, underline the wrong word and write the correct one in the blank provided at the end of the line.For a missing word, mark the position of the missing word with a “∧” sign and write the word you believe to be missing in the b lank provided at the end of the line.For an unnecessary word, cross out the unnecessary word with a slash “/” and put the word in the blank provided at the end of the line.If the line is correct, place a V in the blank provided at the end of the lineExampleWhen ^ art museum wants a new exhibit, (1) anIt never buys things in finished form and bangs (2) neverthem on the wall. When a natural history museum (3) vwants an exhibition, it must often build it. (4) exhibitProofread the given passage on ANSWER SHEET TWO as instructed.One of the most important non-legislative functions of the U.S Congressis the power to investigate. This power is usually delegated to committees - eitherstanding committees, special committees set for a specific(1)____purpose, or joint committees consisted of members of both houses. (2)____Investigations are held to gather information on the need forfuture legislation, to test the effectiveness of laws already passed,to inquire into the qualifications and performance of members andofficials of the other branches, and in rare occasions, to lay the (3)____groundwork for impeachment proceedings. Frequently, committeesrely outside experts to assist in conducting investigative hearings (4)____and to make out detailed studies of issues. (5)____There are important corollaries to the investigative power. Oneis the power to publicize investigations and its results. Most (6)____committee hearings are open to public and are reported (7)____widely in the mass media. Congressional investigationsnevertheless represent one important tool available to lawmakers (8)____to inform the citizenry and to arouse public interests in national issues. (9)____Congressional committees also have the power to compeltestimony from unwilling witnesses, and to cite for contemptof Congress witnesses who refuse to testify and for perjurythese who give false testimony. (10)____Part Ⅲ Reading Comprehension (30 min)In this section there are four reading passages followed by a total of fifteen multiple-choice questions. Read the passages and then mark your answers on your colored answer sheet.TEXT AFarmers in the developing world hate price fluctuations. It makes it hard to plan ahead. But most of them have little choice: they sell at the price the market sets. Farmers in Europe, the U.S. and Japan are luckier: they receive massive government subsidies in the form of guaranteed prices or direct handouts. Last month U.S. President Bush signed a new farm bill that gives American farmers $190 billion over the next 10 years, or $83 billion more than they had been scheduled to get, and pushes U.S. agricultural support close to crazy European levels. Bush said the step was necessary to "promote farmer independence and preserve the farm way of life for generations". It is also designed to help the Republican Party win control of the Senate in November's mid term elections.Agricultural production in most poor countries accounts for up to 50% of GDP, compared to only 3% in rich countries. But most farmers in poor countries grow just enough for themselves and their families. Those who try exporting to the West find their goods whacked with huge tariffs or competing against cheaper subsidized goods. In 1999 the United Nations Conference on Trade and Development concluded that。
教育质量问题和解决方案写英语作文全文共3篇示例,供读者参考篇1Education quality is a crucial aspect of any society's development. It directly impacts the individual's learning experience, skills acquisition, and future opportunities. However, the issue of education quality has been a major concern in many countries around the world. In this essay, we will discuss the problems related to education quality and propose some solutions to address these challenges.One of the main problems with education quality is the lack of adequate resources. Many schools lack proper infrastructure, such as classrooms, libraries, and laboratories, which hinders students' learning experience. Additionally, the shortage of qualified teachers and teaching materials further undermines the quality of education provided to students. This ultimately leads to poor academic performance and a lack of essential skills needed for the workforce.Another significant issue is the outdated curriculum and teaching methods. The traditional rote-learning approachfocuses on memorization rather than critical thinking and problem-solving skills. As a result, students are not adequately prepared for the challenges of the modern world, where innovation and creativity are highly valued. Moreover, the curriculum often fails to address real-world issues, such as environmental sustainability and social justice, which are crucial for developing well-rounded individuals.Furthermore, the unequal distribution of educational opportunities exacerbates the problem of education quality. Many students from disadvantaged backgrounds do not have access to quality education due to factors such as poverty, lack of transportation, and discrimination. This perpetuates the cycle of poverty and social inequality, preventing these individuals from reaching their full potential.To address these challenges and improve education quality, several solutions can be implemented. Firstly, adequate funding should be provided to schools to improve infrastructure, hire qualified teachers, and procure teaching materials. This will create a conducive learning environment that enhances students' academic performance and overall well-being.Secondly, curriculum reform is essential to adapt to the changing needs of society. The curriculum should focus ondeveloping critical thinking, problem-solving, and communication skills to prepare students for the demands of the 21st century. Additionally, incorporating real-world issues into the curriculum will help students become socially responsible citizens and global leaders.Thirdly, efforts should be made to promote inclusivity and diversity in education. Special programs and scholarships can be implemented to support students from marginalized backgrounds and ensure they have equal access to quality education. This will empower these individuals to break the cycle of poverty and contribute positively to society.In conclusion, education quality is a critical issue that requires urgent attention and action. By addressing the problems related to resources, curriculum, and equal opportunities, we can create a more equitable and inclusive education system that empowers students to reach their full potential. Together, we can build a brighter future for the next generation.篇2Title: Education Quality Issues and SolutionsEducation plays a crucial role in shaping the future of individuals and society. However, the quality of education has been a persistent concern in many countries around the world. This essay will explore the key issues affecting education quality and propose solutions to address them.One of the main issues impacting the quality of education is the lack of adequate resources. Many schools struggle with overcrowded classrooms, outdated textbooks, and a shortage of qualified teachers. This can lead to a poor learning environment and hinder students' academic performance. To address this issue, governments should allocate more funding to education and prioritize investments in infrastructure, teacher training, and educational materials.Another challenge facing education quality is the disparities in access to education. In many regions, marginalized groups such as girls, children from low-income families, and students with disabilities, have limited access to quality education. This can perpetuate social inequality and hinder economic development. To promote inclusivity and equity in education, policymakers should implement targeted interventions to reach marginalized communities and provide them with the necessary support to access quality education.Additionally, the curriculum and teaching methods used in schools can also impact education quality. A one-size-fits-all approach to education may not cater to the diverse learning needs of students. To improve the quality of education, schools should adopt a more personalized and student-centered approach that focuses on individual learning styles and interests. This can help students develop critical thinking skills, creativity, and problem-solving abilities.Furthermore, the lack of accountability and transparency in the education system can also undermine education quality. Without proper monitoring and evaluation mechanisms, it is difficult to assess the effectiveness of educational policies and programs. To ensure accountability, governments should establish independent education quality assurance bodies that can evaluate schools, teachers, and student performance. This can help identify areas for improvement and guideevidence-based decision-making in education policy.In conclusion, education quality is a multifaceted issue that requires a comprehensive approach to address. By investing in resources, promoting inclusivity, adopting student-centered approaches, and enhancing accountability, we can improve the quality of education and provide all students with theopportunity to succeed. Education is not just a basic human right but a powerful tool for driving social progress and economic development. It is imperative that we work together to ensure that every child has access to quality education and the opportunity to fulfill their potential.篇3The Quality of Education: Problems and SolutionsIntroductionEducation is a crucial factor in shaping the future of individuals and society as a whole. However, the quality of education has been a growing concern in many countries around the world. In this essay, we will discuss the issues surrounding education quality and propose solutions to address them.Problems1. Lack of resources: One of the primary issues affecting education quality is the lack of resources in schools. This includes inadequate funding, outdated textbooks, and a shortage of qualified teachers.2. Overcrowded classrooms: In many schools, classrooms are overcrowded, making it difficult for teachers to provideindividual attention to students. This can lead to students falling behind and not reaching their full potential.3. Inequality in education: There is a significant disparity in education quality between urban and rural areas, as well as between rich and poor communities. This inequality can result in limited opportunities for students from disadvantaged backgrounds.4. Outdated curriculum: The curriculum in many schools is outdated and fails to prepare students for the demands of the modern world. This can result in a lack of essential skills needed for success in the workforce.5. Standardized testing: The emphasis on standardized testing can lead to a narrow focus on rote memorization and exam preparation, rather than fostering critical thinking and creativity in students.Solutions1. Increase funding: Governments should allocate more resources to education, including funding for new textbooks, technology, and teacher training. This will help improve the overall quality of education in schools.2. Reduce class sizes: Smaller class sizes can allow teachers to provide more individualized attention to students, leading to better learning outcomes. This can be achieved by hiring more teachers and building more schools in areas with high student populations.3. Address inequality: Efforts should be made to bridge the gap in education quality between different communities. This can include providing additional support to schools in disadvantaged areas and ensuring that all students have access to quality education.4. Update curriculum: The curriculum should be updated to reflect the needs of the modern world. This includes incorporating digital literacy, critical thinking skills, and problem-solving abilities into the education system.5. Shift focus from standardized testing: Educators should move away from a heavy reliance on standardized testing and instead focus on holistic assessments that measure a broader range of skills and abilities in students.ConclusionIn conclusion, the quality of education is a critical issue that must be addressed to ensure the future success of students. Byinvesting in resources, reducing class sizes, addressing inequality, updating the curriculum, and shifting focus from standardized testing, we can improve education quality and provide all students with the tools they need to thrive in the modern world. It is essential for governments, educators, and communities to work together to create a more equitable and effective education system for all.。
2003Special issueOn the quality of ART1text clusteringLouis MasseyRoyal Military College of Canada,Kingston,Ont.,Canada K7K 7B4AbstractThere is a large and continually growing quantity of electronic text available,which contain essential human and organization knowledge.An important research endeavor is to study and develop better ways to access this knowledge.Text clustering is a popular approach to automatically organize textual document collections by topics to help users find the information they need.Adaptive Resonance Theory (ART)neural networks possess several interesting properties that make them appealing in the area of text clustering.Although ART has been used in several research works as a text clustering tool,the level of quality of the resulting document clusters has not been clearly established yet.In this paper,we present experimental results with binary ART that address this issue by determining how close clustering quality is to an upper bound on clustering quality.Crown Copyright q 2003Published by Elsevier Science Ltd.All rights reserved.Keywords:Adaptive resonance theory;Text clustering;Text categorization1.IntroductionWe consider the application of clustering to the self-organization of a textual document collection.Clustering is the operation by which similar objects are grouped together in an unsupervised manner (Jain,Murty,&Flynn,1999;Kaufman &Rousseeuw,1990).Hence,when clustering textual documents,one is hoping to form sets of documents with similar content.Instead of exploring the whole collection of documents,a user can then browse the resulting clusters to identify and retrieve relevant docu-ments.As such,clustering provides a summarized view of the information space by grouping documents by topics.Clustering is often the only viable solution to organize large text collections into topics.The advantage of clustering is realized when a training set and classes definitions are unavailable,or when creating them is either cost prohibitive due to the collection shear size or unrealistic due to the rapidly changing nature of the collection.We specifically study text clustering with Adaptive Resonance Theory (ART)(Carpenter &Grossberg,1995;Grossberg,1976)neural networks.ART neural networks are known for their ability to perform on-line and incremental clustering of dynamic datasets.Contrary to most other types of artificial neural networks such as the popular Back-propagation Multi-Layer Perceptron (MLP)(Rumelhart,Hinton,&Williams,1986),ART is unsupervised and allows for plastic yet stable learning.ART detects similarities among data objects,typically data points in an N-dimensional metric space.When novelty is detected,ART adaptively and autonomously creates a new category.Another advantageous and distinguishing feature of ART is its ability to discover patterns at various levels of generality.This is achieved by setting the value of a parameter known as vigilance and denoted by r ;r [ð0;1 :ART stability and plasticity properties as well as its ability to process dynamic data efficiently make it an attractive candidate for clustering large,rapidly changing text collections in real-life environments.Although ART has been investigated previously as a means of clustering text data,due to numerous variations in ART implementations,experimental data sets and quality evaluation method-ologies,it is not clear whether ART performs well in this type of application.Since ART seems to be a logical and appealing solution to the rapidly growing amount of textual electronic information processed by organizations,it would be important to eliminate any confusion surrounding the quality of the text clusters it produces.In this paper,we present experimental results with a binary ART neural network (ART1)that address this issue by determining how close clustering quality achieved with ART is to an expected upper bound on clustering quality.We will consider other versions of ART in future work.0893-6080/03/$-see front matter Crown Copyright q 2003Published by Elsevier Science Ltd.All rights reserved.doi:10.1016/S0893-6080(03)00088-1E-mail address:massey-l@rmc.ca (L.Massey).2.Related workWe consider one of the many applications of text clustering in thefield of Information Retrieval(IR) (VanRijsbergen,1979),namely clustering that aims at self-organizing textual document collections.This appli-cation of text clustering can be seen as a form of classification by topics,hence making it the unsupervised counterpart to Text Categorization(TC)(Sebastiani,2002). Text self-organization has become increasingly popular due to the availability of large document collections that change rapidly and that are quasi-impossible to organize manually.A typical example is the organization of web documents according to some topics hierarchy like the Yahoo e hierarchy(Heuser&Rosenstiel,2000).Even TC becomes unsuitable in such environments because supervised learn-ing of classifiers is not plastic and thus requires retraining upon detection of novelty.Representative work on text clustering includes,among many others,(Cutting,Karger, Pedersen,&Tukey,1992;Kohonen et al.,2000;Steinbach, Karypis,&Kumar,2000).There has also been interesting work done on incremental and on-line text clustering with non-neural approaches(see for instance(Can(1993)and Wong and Fu(2000)).MacLeod and Robertson(1991)were as far as we know thefirst researchers to consider ART for text clustering. They used a modified version of ART1in which the similarity computation and weight updates involved domain and task specific knowledge.The inclusion of this knowl-edge makes the ART implementation more complex but may advantage it over a basic form of ART1.We intend to test this type of ART network in future work,but for now we are interested in establishing the baseline quality that can be achieved with a more basic implementation.The relatively small Keen and Cranfield text collections(800and1400 documents,respectively),were used to test MacLeod’s algorithm.ART clustering quality was evaluated with the F measure computed on the results of provided queries.This approach to cluster evaluation does not allow for a comprehensive evaluation of the resulting cluster structure, since it only considers the set of queries.The clustering quality results were not very good with F1¼0:25and0.15 (minimum quality value is0and maximum1),but were comparable with other non-neural clustering results pub-lished on the same data sets.Merkl(1995)compared ART with Self-Organizing Maps(SOM)(Kohonen,2001)for the clustering of a small collection of documents and concluded that SOM forms better clusters based on a visual qualitative evaluation.We want to avoid such a subjective evaluation. Moreover,we think that SOM has several weaknesses compared to ART that make it unsuitable for document clustering in a real-life environment characterized by high volume of dynamic data.Indeed,it is unstable under growth while ART provides inherent stability and plasticity. Furthermore,the multiple iterations required to attain convergence with SOM are incompatible with a real-time environment.On the other hand,some research concluded that ART text clustering resulted in good quality clusters.Vlajic and Card(1998)used a modified ART2network to create a hierarchical clustering of a small number of web pages. They report that clustering was‘appropriate in all cases, when compared to human performance[…]’,but provide no quantitative result.In previous work,we also considered hierarchical clustering,but with ART1and with a small database of document titles(Massey,2002a).Clustering quality was deemed adequate based on the percentage of overlap between clusters and expected classification.Our evaluation measure and text collection were non-standard. Rajaraman and Tan(2001)apply fuzzy ART to the task of Topics Detection and Tracking,in which the aspect of topic detection is performed by ART text clustering.They use a small set of1468news articles and attempt to measure the ability of the ART network to detect novelty.However, once again only qualitative results are presented.Finally, Kondadadi and Kozma(2002)compare KMART,their soft clustering version of ART,to Fuzzy-ART and k-means.The text data consists of2000documents downloaded from the web as well as another2000newsgroup documents.Quality evaluation is based on a one-to-one match of the documents in the clusters with the documents in the specified category. K-MART and Fuzzy-ART results are encouraging with above50%matching for100–500document subsets of the original text collections,while k-means stays in the range of 22–35%matching.However,this evaluation method is optimistic since it does not account for false positives(i.e. documents that are present in a cluster but do not match documents in the corresponding desired topic).Our interest in this paper is the study of unsupervised text organization,hence supervised versions of ART(Carpenter Grossberg,&Reynolds,1991a)applied to text categoriz-ation(Petridis,Kaburlasos,Fragkou,&Kehagias,2001) will not be considered.3.Experimental settingsWe selected two well-established cluster quality evaluation measures:Jaccard(JAC)(Downton&Brennan, 1980)and Fowlkes–Mallows(FM)(Fowlkes&Mallows, 1983):JAC¼a=ðaþbþcÞð1ÞFM¼a=ððaþbÞðaþcÞÞ1=2ð2Þwherea is the pair-wise number of true positives,i.e.the totalnumber of document pairs grouped together in the expected solution and that are indeed clustered together by the clustering algorithm;L.Massey/Neural Networks16(2003)771–778 772b is the pair-wise number of false positives,i.e.thenumber of document pairs not expected to be grouped together but that are clustered together by the clustering algorithm;c is the pair-wise number of false negatives,i.e.thenumber of document pairs expected to be grouped together but that are not clustered together by the clustering algorithm.We also use a measure that computes the F1clustering quality value.It uses the same underlying pair-wise counting procedure as Jaccard and Fowlkes–Mallow to establish a count of false negatives and false positives,but combines those values following the F-measure(VanRijsbergen, 1979)formulae:F b¼ðb2þ1Þpr=½b2pþr ð3Þwhere p¼a=ðaþbÞis known as the precision and r¼a=ðaþcÞas recall.b is set to1to give equal weighting to precision and recall.We must note that other text clustering work,such as(Larsen and Aone(1999)and Wong and Fu (2000)),have evaluated clustering quality with F1computed on the best cluster-class match.Our initial experiments with this approach indicated that it might unfairly inflate quality. We have not conducted an indepth analysis of this divergence at this point in time,but we will as part of future work.The‘ModApte’split(Apte,Fred Damerau,&Weiss, 1994)of the Reuter-21578Distribution1.01data set is used for our experiments.This data sets is known to be challenging because of skewed class distribution,multiple overlapping categories,and its real-life origin(Reuter newswires during the year1987,in chronological order). We evaluate clustering results against the desired solution originally specified by Reuter’s human classifiers.We only use the desired solution information to evaluate clustering results,i.e.after the clusters have been formed. Reuter is a benchmark data set for ing this data set specific split and the F1quality measure makes compari-son with published TC results(Yang&Liu,1999)on the same split possible.This is an important and we believe innovative aspect of our experimental approach:TC F1 quality results are used as an upper bound for cluster quality since learning in a supervised framework with labeled data provides the best possible automated text classification(with current technology).Thus,clustering can be expected to approach this level of quality but not exceed it since it relies solely on the information present in the data itself.This way of evaluating clustering quality allows one to clearly establish the level of quality obtained by a clustering algorithm as a percentage of the upper bound quality.We use the k-means(MacQueen,1967)clustering algorithm to establish a lower bound for quality.Our rationale is that since k-means represents one of the simplestpossible approaches to clustering,one would expect that anyslightly more advanced algorithm would exceed its cluster-ing quality.The parameter k is set to the number of topics(93)specified by the domain experts who manuallyorganized the Reuter text collection.K-means initial clustercentroids are determined randomly and clustering results areaveraged over10trials to smooth out extreme valuesobtained from good and bad random initialization.Our hopeis that ART clusters would exceed significantly the qualityobtained with k-means and approach the quality ofsupervised TC.In this set of experiments,we use the simplest form ofART,binary ART1in fast learning mode,to establishwhat should be the baseline level of quality attainable byART neural networks.ART1networks consist of twolayers of neurons:N input neurons and M outputneurons,where N is the input size and M the numberof clusters.Neurons are fully connected with both feed-forward and feedback weighted links.The feed-forwardlinks connecting to the output neuron j are representedby the real vector W j while the feedback links from thatsame neuron are represented by the binary vector T j:The latter stores the prototype representing cluster j:Wespecifically use Moore’s ART1implementation(Moore,1988),as follows:1Initialize network weights and provide parametervalues:0,r#1(the vigilance parameter)and L.1W j¼1=ð1þNÞfor all forward connection weightsT j¼1for all feedback connection weights2Set the output neurons activation u j¼0for j¼1…Mand present a document X k to the network3Compute output activations:u j¼X k·W j for j¼1…Mand where·is the inner product.4Competition between output units:select the mostsimilar category represented by output neuron j pwith maximal activation.5Vigilance test:determine if j p is close enough toX k:k Xk^T j p k=k X k k$rwhere‘^’is the logical AND operationIf true,go to step6(resonance mode);otherwise,go to step8(search mode).6Update weights for winning node:T0j p¼T^j p X kW0j p¼LðT j p^X kÞ=ðL21þk T j p^X k kÞ7Return to step2with a new document.8u j p¼21(remove category j p from current search)and return to step4.The vigilance parameter r[ð0;1 determines the level of abstraction at which ART discovers clusters.Moreover,the minimal number of clusters present in the data can be determined by minimal vigilance(Massey,2002b),computed1Available from /resources/testcollections/reuters21578/L.Massey/Neural Networks16(2003)771–778773as r min ,1=N where N is the number of features (words)used to represent a document.We chose a value of r min ¼0:0005as the initial vigilance parameter and we increment it until we find the best clustering quality.We stop increasing vigilance when more than 200clusters are obtained because such a large number of clusters would simply result in information overload for a user and therefore not achieve the intended objective of text clustering.A binary vector-space (Salton &Lesk,1968)represen-tation was created for the Reuter ModApte´test set.Only the test set was clustered for compatibility reasons with TC results and also because in unsupervised learning,one must assume that a training set is unavailable.A standard stop word list was used to remove frequent words and a simple feature reduction by term selection based on term frequency was applied to reduce the dimensionality of the original documents feature space.This approach was judged very effective for TC by Yang and Pedersen (1997)).4.Experimental resultsWe eliminated words that appear in 10,20,40and 60or less documents.In the first case,a total of 2282term features were retained while in the last only 466were.Our experiments indicated that less radical feature selection not only increased the number of features and consequently processing time,but also resulted in lower quality clusters in some cases (Fig.1).Best quality is achieved at vigilance value of 0.05,with 106clusters,a number close to the expected number of topics specified by the domain experts who labeled the data (93).Vigilance levels past 0.1result in over 250clusters,which is not desirable for users as explained previously.The results shown in Fig.1were obtained with a single pass in the data.In reality,ART converges to a stable representation after at most N 21presentations of the data (Georgiopoulos,Heileman,&Huang,1990).By stable,it is meant that if the same document is presented several times to the network,it should be assigned to the same category,and presenting the same inputs over and over should not change the cluster prototype values.Unstable clusters areproblematic since an identical document submitted at different times may end up in different clusters.Further-more,we show in Fig.2a that cluster quality increases after ART has stabilized.Only four iterations were required to attain a stable representation,which is much less than the theoretical upper bound of N 21:However,in real world,high-volume operations this could still be a problem as little idle time in the system operation may be available to stabilize topics representation.We have processed the documents in their natural order,i.e.the chronological order in which they have been created and thus the order in which they would be submitted to a classification system.This simulates the real-world environ-ment where there is no control over the order in which documents are created.As with any on-line clustering algorithm,ART gives different results depending on the order of presentation of the data.This is expected since clustering decisions are taken for each sequentially submitted document,compared to batch clustering that considers all data at once.We submitted the data set in 15different random orders to ART and averaged clustering quality for each order.Fig.2b shows that other orders of presentation are much worse than the natural,chronological order of the documents in Reuter.This is encouraging because if quality was higher for other orders of presen-tation,one would face the problem of finding the best order among the very large number of possibilities or design a way to combine results from different orders.It is possible that other text collections face this problem.Maybe it just happens that Reuter natural order is simply compatible with the desired solution,while in other cases this may not happen.After all,there are many ways to organize large text collections.Some versions of ART use a similarity measure claimed to make it less susceptible to order variations (Sadananda &Sudhakara Rao,1995).Our initial exper-iments with Sadananda and Sudhakara Rao’s similarity measures are inconclusive at this point in time.However,their proposed similarity measure will in some circum-stances not allow the vigilance test (step 5of the algorithm)to pass even for a newly created category node.Hence,novelty integration becomes impossible unless thevigilanceFig.1.(a)More radical term selection (removing words appearing in 60documents or less)results in better clustering quality in some cases,(at vigilance 0.05),compared to removing terms appearing in only 20documents or less.(b)More radical feature selection also results in much smaller data set dimentionality which in turn allows for more rapid processing.(c)Vigilance 0.05finds a number of cluster close to the expected number of 93.Vigilance of 0.1creates too many clusters for users.L.Massey /Neural Networks 16(2003)771–778774test is not performed for new category nodes.This amounts to a simple modification to the algorithm listed in this paper.Fig.2c .shows that ART1cluster quality clearly exceeds the lower bound established by K -means.However,clustering quality achieved by ART with random orders of presentation is comparable to K -means.This implies that if the natural order of presentation does not correspond to the chosen organization of the data,ART1will not do better than K -means.We now compare ART1clustering quality to the upper bound expected for cluster quality:the best TC results obtained with Support Vector Machines (SVM)and k-Nearest Neighbors (kNN)published in Yang and Liu (1999)(Fig.3).ART1achieves 51.2%of the TC paring to 16.3%level of quality for k -means,the lower bound,ART1does much better but is still only about half-way to the optimal expected quality.There is also a potential for lower quality with other orders of presentation.We must however point out that the solution we use to evaluate clusters is merely one among many other useful ways to organize the text collection.Hence,we merely evaluate the ability of ART to recover the specified solution.A users study may better validate the structure discovered by ART,but such studies are costly and also subjective.We also built a small program that simulates ART cluster prototype updating behavior and attempts to assign each document to its desired topic.We found that 2.2%of documents could not be assigned to their designated topic.Thus,even in the best conditions,perfect clustering is not possible with ART1with this data set in natural order since right from the start about 2%quality is lost to the order ofpresentation.This can be explained as follows:a document is assigned to a topic if it has a sufficiently number of overlapping features,as determined by the vigilance par-ameter.Furthermore,over time as documents are submitted to the network,the number of active features in prototype vectors decreases,which makes matching a document with its desired topic more unlikely.This is caused by the prototype updating mechanism that intersects documents assigned to a topic with that topic prototype.So,in our simulation,if no feature of a document overlap with the prototype for the document desired topic,it means that the expected solution cannot be satisfied with ART1and with this order of presentation.Better prototype updating may be required to improve quality,such as (MacLeod &Robertson,1991),which used the union of a document and its prototype features.Finally,while conducting our experiments,we noticed an interesting phenomenon:clusters do not necessarily form at the specified level of abstraction.In other words,ART sometimes discovers topics generalizing or specializing desired topics.A generalization is a cluster that includes two or more classes (a class being a group of documents representing a desired topic).A specialization on the other hand is a class that includes two or more clusters.In a sense,such behavior can be expected from clustering algorithms since they rely solely on similarity among data items rather than on directions by a domain expert.Fig.4shows a portion of the confusion table built from the matches between clusters and classes to illustrate generalizations and specializations.A match is the number of documents a class and a cluster have in common.We note from Fig.4that:†cluster 0is dominated by 169documents from class 25(topic earnings)out of a total of 1087(16%)documents expected to belong to thatclass;Fig.2.All results shown for vigilance 0.05.(a)Stabilization improves ART clustering quality.(b)Random orders of presentation even when stabilized give much worse clusters than the natural order of the documents in Reuter.(c)ART clusters (in natural order,stabilized)are of better quality than k -means ðk ¼93Þ:Fig.3.ART1clustering F 1with stabilization at vigilance 0.05for data in its natural order (ART1Nat).For both TC methods (SVM and k -NN),the micro-averaged F1values is used for compatibility with our F1pairmeasure.†cluster 1is dominated by 741documents from class 25(earnings)out of a total possible of 1087(68%);†cluster 3is dominated by 598documents from class 16(acquisitions)out of a total possible of 719(83%),but there is also a strong presence from class 0(trade),class 1(grain),class 2(crude),class 11(shipping)and class 18(interest rate).Hence,one can consider that clusters 0and 1actually correspond to class 25(earnings)with 910of the 1087documents,so topic earnings is specialized.Cluster 3corresponds to classes 16(acquisitions),class 0(trade),class 1(grain),class 2(crude),class 11(shipping),and class 18(interest rate)for a total of 1106of 1395documents.So all these classes are generalized by cluster 3.Other class-cluster matches may be deemed to simply lower generalization and specialization quality.We designed a quality evaluation methodology that,contrary to existing clustering evaluation measures,does not penalize generalizations and specializations.For each class,it looks for all clusters that match the class.This allows for the discovery of specializations.Then,for each of the matching cluster,it also looks for all matching class,which accounts for generalizations.Extraneous documents in the latter case are the clustering errors and a F 1value is computed based on these errors.Fig.5shows quality evaluation with this measure,which we call Sub-Graph Dispersion (SGD)because a sub-graph is created for each class when looking for matches.If one considers generalizations and specializations of the expected solution as acceptable,higher quality can be computed at lower vigilance,but the quality of generalizations and specialization decreases as vigilance increases.This method of evaluation needs to be refined before final conclusions on the true impact of learning at different levels of abstraction on clustering quality can be drawn.For instance,all matches are currently considered but some negatively affect quality and should not be included as being part of generalizations or specializations.5.Conclusions and future workText clustering work conducted with ART up to now has used many different forms of ART-based architec-tures,as well as different and non-comparable text collections and evaluation methods.This situation resulted in confusion as to the level of clustering quality achievable with ART.As a first step towards resolving this situation,we have tested a simple ART1network implementation and evaluated its text clustering quality on the benchmark Reuter data set and with the standard F 1measure.K -means clustering quality was used as the lower bound on quality while published results with supervised TC were used as an upper bound on quality.Our experiments have demonstrated that text clusters formed by ART1achieve 51%of TC upper bound and exceed the lower bound considerably.Consequently,about half of the evidence needed to recover the expected document organization solution is available directly from the data under the form of inter-document similarity rather than from costly and time consuming handcrafting of a large labeled training data set.Whether this level of quality is sufficient is a task specific question and ultimately a matter of cost/quality trade-off:it is a choice between higher quality supervised document categoriz-ation obtained at high development and maintenance cost versus lower quality clusters obtained at basically no cost.At least we provide here a clear picture of the quality aspect by establishing the baseline quality to be expected with ART.Although ART clusters were of medium quality,ART has the unique advantage of proceeding entirely without human intervention,plus offers the interesting properties of plasticity and stability.Should novelty be detected by the network,a new topic would automatically be created as part of normal system operation.This contrasts with supervised TC,which would require downtime for re-training and related human intervention to prepare a new training set.Therefore,despite lower quality,there may be some situations where ART-based text clustering is a necessity.Furthermore,clustering quality can be increased if one considers discovery of topics at other levels of abstraction as acceptable.Hence,an important area of future research is to explore evaluation measures that do not penalize specializations and generalizations.We are also looking into better feature selection that may also help improve cluster quality.For instance,preliminary experiments with TF-IDF,a well known Information Retrieval measure of term importance,are encouraging in that respect.More-over,more advanced ART architectures with nonbinary representation (such as ART2(Carpenter,Grossberg,&Rosen,1991b ),fuzzy ART (Carpenter,Grossberg,&Rosen,1991c ),MacLeod’s ART (MacLeod &Robertson,1991)and FOSART (Baraldi &Alpaydin,2002))may further improve cluster quality.We are currently inves-tigating these avenues.As well,in the Reutercollection,Fig.5.Increased quality is computed by SGD at lower vigilance by not penalizing generalizations and specializations.Stabilized results shown.L.Massey /Neural Networks 16(2003)771–778776。