同步外研英语选修六新突破课时分层作业9 Learning abot Langage 含解析
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课时分层作业(二)Ⅰ.单词拼写1.This machine is_________(优越)in many respects to that.2. He's quite ________(无知的)of things abroad.3.She________(抱怨) that no one had been at the airport to meet her.4.From the way he talked,I________(认为) him to be your boss.5.He didn't seem to________(想起) having met her.6.She was too________(诚实的) a person to compliment him on his poor work.7.The heavy traffic is a constant source of________(烦恼).8.Put a tie on—it'll make you look more________(体面).9.No enemy can frighten us into________(屈服).10.If you are________(压垮) by something,it upsets you a great deal.【答案】 1.superior 2.ignorant plained 4.presumed 5.recollect 6.sincere 7.irritation 8.respectable 9.submission 10.crushedⅡ.阅读理解AI learnt about the Pygmalion effect(皮格马利翁效应) when I was 7 years old at Riverdale School in Palmerston North and I copied Melissa Crawford's answers in a spelling test. Before that I was average at school but after that, because Melissa Crawford was smart, and I got all the right answers, I got put in all the smart kids groups.From then I did really well at school because it was believed by the teachers that I would and I also got grouped with the smart kids. This experience that occurred at my primary school shows just how important the Pygmalion effect is in terms of being around mentors(导师) that expect that you're going to do well and also being around people who are smart.The Pygmalion effect is one principle you want to use if you want to make money fast. Have mentors that expect you will make money fast and as an extra boost hang around, copy and learn from other people who are also making money fast.Yesterday this site had over 5,000 unique visitors and the traffic to it is increasing all the time. A year ago I contacted a group of people who got lots of traffic in their sites and I learnt from them. Truthfully I don't know if they expected me to start getting decent traffic to websites but I imagined they did.So there you have it—the Pygmalion effect.P.S. My grammar and spelling are not that great nowadays but that's actually completely irrelevant(不相关的) when it comes to getting lots of visitors to your site.【语篇解读】 文章通过作者自己的经历告诉我们皮格马利翁效应的神奇力量。
课后小练9Module 3Introduction & Readingand VocabularyⅠ.单句语法填空1.When________(complete), the project would serve as a site for military training.2.__________(wait) for a few days, we received a reply,________(ask) us not to take any action.3.________(mood) people are very difficult to deal with.4.When he reached the final line, everyone burst out________(laugh).5.He glanced over at her,________(note) that though she was tiny, she seemed very well put together.6.If you buy more than ten, they knock 20 pence________the price.7.At________time, they had cooperated with each other pleasantly.8.We had a nice visit________the phone.9.I have absolute trust________the teachers.答案1.completed 2.Having waited; asking 3.Moody4.laughing 5.noting 6.off7.one8.on/over9.inⅡ.课文语法填空The first time I met Roy, I thought him 1.________popular boyamong his classmates, for he liked to tell stories, 2.________made others burst out laughing. Being a new student, I felt shy and lonely. Roy was kind to me and helped me get to know my new classmates by inviting me to join his particular group. We became good friends, who could share 3.________other's inner feelings.It was his father's death as a result of being knocked over by a car 4.________changed him completely. He became 5.________(mood) and lost interest 6.________his school work; furthermore, 7.________were no longer close.One day, I caught Roy 8.________(go) through the pockets of people's coats in the cloakroom, a wallet in his hand. My mouth fell open and I just looked at him without being able to say a word...Last week, we raised £500 for a charity, but it 9.________(steal) the next morning. I thought it might be Roy, so 10.________(think) about the situation for a while, I decided to ask him about the theft. And I went to see him...答案1.a 2.which 3.each 4.that 5.moody 6.in7.we8.going9.was stolen10.having thoughtⅢ.阅读理解AWhen it comes to friends,I desire those who will share myhappiness,who possess wings of their own and who will fly with me. I seek friends whose qualities illuminate (照亮) me and train me up for love. It is for these people that I reserve the glowing hours, too good not to share.When I was in the eighth grade,I had a friend. We were shy and “too serious”about our studies when it was becoming fashionable with our classmates to learn acceptable social behaviors. We said little at school,but she would come to my house and we would sit down with pencils and paper, and one of us would say, “Let's start with a train whistle today.”We would sit quietly together and write separate poems or stories that grew out of a train whistle. Then we would read them aloud. At the end of that school year, we, too,were changing into social creatures and the stories and poems stopped.When I lived for a time in London,I had a friend.He was in despair and I was in despair. But our friendship was based on the idea in each of us that we would be sorry later if we did not explore this great city because we had felt bad at the time. We met every Sunday for five weeks and found many excellent things.We walked until our despairs disappeared and then we parted. We_gave_London_to_each_other.For almost four years I have had a remarkable friend whose imagination illuminates mine. We write long letters in which we often discover our strangest selves. Each of us appears,some times in a funnyway, in the other's dreams. She and I agree that,at certain times,we seem to be parts of the same mind. In my most interesting moments,I often think, “Yes, I must tell...”We have never met.It is such comforting companions I wish to keep.One bright hour with their kind is worth more to me than the lifetime services of psychologist,who will only fill up the healing silence necessary to those darkest moments in which I would rather be my own best friend.1. In the eighth grade, what the author did before developing proper social behavior was to________.A. become serious about her studyB. go to her friend's house regularlyC. learn from her classmates at schoolD. share poems and stories with her friend2. In Paragraph 3, the underlined sentence probably means____.A. our exploration of London was a memorable gift to both of usB. we were unwilling to tear ourselves away from LondonC. our unpleasant feelings about London disappearedD. we parted with each other in London3. According to Paragraph 4,the author and her friend________.A. call each other regularlyB. have similar personalitiesC. enjoy writing to each otherD. dream of meeting each other4. What is the best title for the passage?A. Unforgettable ExperiencesB. Remarkable ImaginationC. Lifelong FriendshipD. Noble Companions答案与解析1.D细节理解题。
课时分层作业(九)(建议用时:40分钟)Ⅰ.单词拼写1.A (漫不经心的) newspaper reader wouldn't like articles on politics every day.2.Primary school teachers use a lot of (视觉的) aids.3.I benefited much from my (联系) with him.4.He always takes the lead in (响应) to the government's call.5.I looked at the map to (使恢复) my memory of the road.6.He bought the house at considerable (费用).7.The company has met their export (目标).8.The event is (值得的) of being remembered.9.He won't let it trouble his (良心).10.Wet weather is a (特征) of life in this area.【答案】 1.casual 2.visual 3.association4.response 5.refresh 6.expense7.target8.worthy9.conscience10.featureⅡ.阅读七选五Evaluating Sources of Health InformationMaking good choices about your own health requires reasonable evaluation. A key first step in bettering your evaluation ability is to look carefully at your sources of health information. Reasonable evaluation includes knowing where and how to find relevant information, how to separate fact from opinion, how to recognize poor reasoning, and how to analyze information and the reliability of sources. 1 Go to the original source. Media reports often simplify the results of medical research. Find out for yourself what a study really reported, and determine whether it was based on good science. Think about the type of study. 2Watch for misleading language. Some studies will find that a behavior “contributes to” or is “associated with” an outcome; this does not mean that a certain course must lead to a certain result. 3 Carefully read or listen to information inorder to fully understand it.Use your common sense. If a report seems too good to be true, probably it is. Be especially careful of information contained in advertisements. 4 Evaluate“scientific”statements carefully, and be aware of quackery(江湖骗术).5 Friends and family members can be a great source of ideas and inspiration, but each of us needs to find a healthy lifestyle that works for us.Developing the ability to evaluate reasonably and independently about health problems will serve you well throughout your life.A.Make choices that are right for you.B.The goal of an ad is to sell you something.C.Be sure to work through the critical questions.D.And examine the findings of the original research.E.Distinguish between research reports and public health advice.F.Be aware that information may also be incorrectly explained by an author's point of view.G.The following suggestions can help you sort through the health information you receive from common sources.【答案】1-5GDFBAⅢ.完形填空A Toronto man is offering a free roundtheworld air ticket to the right woman.But 1 apply.You must be named Elizabeth Gallagher and have a Canadian 2 .Jordan Axani,28,said he and his then girlfriend,Elizabeth Gallagher,booked heavily discounted roundtheworld air tickets in May,but their 3 ended and he did not want her ticket to 4 .The ticket had a strict notransfer(不可转让) 5 ,but since passport information was not required when 6 ,any Canadian Elizabeth Gallagher can 7 it.“I just want to see the ticket go to good use and for someone to 8 a lot of joy,”said Axani.He posted his 9 on a social networking website,and received thousands of e-mails,including thirty from actual Elizabeth Gallaghers with the 10 passports,“More 11 ,there are hundreds of Canadians who are interested in 12their name to Elizabeth Gallagher,”Axani said.“It was absolutely out of 13 ,thousands of emails,people around the world 14 their stories of travel.”Axani wrote in his post that he is not 15 anything in return and that the woman who uses the 16 ticket can choose to either travel with him or 17 the ticket and travel on her own.The 18 is scheduled to start on December 21 in New York City and continue on to Milan,Prague,Paris,Bangkok and New Delhi before 19 in Toronto on January 8.He said the 20 woman will be announced on the website and the trip will be shared online.【语篇解读】本文是一篇记叙文。
课时分层作业(三)[语言知识练习固基础]Ⅰ.单句语法填空1.I have a longing(long) for a place where I will not have any worries or cares.2.There are,roughly(rough) speaking, three possible solutions to our problems.3.There is no doubt that a cure for AIDS will be found.4.Climbing in the room cautiously from the window, he found himself standing(stand) face to face with his aunt.5.In the reading room, we found her seated at a desk, with her attention fixed(fix) on a book.6.Tim is in shape even though he doesn't get much exercise.7.His cousin Jim didn't behave himself(he) and thus left a bad impression on the guests.8.Don't hesitate to contact(contact) me if you need any more informatio n.9.I missed seeing my brother off at the airport because my car was held up in a traffic jam.10.Everything arranged(arrange), the manager left for England to attend an important business meeting.Ⅱ. 选词填空. Besides dieting, exercising plays an important part in losing weight.2.The hall was full, and hundreds of fans had to be turned away.3.A child came up to me and showed me the way to the station.4.They started looking around for the missing boy in the surrounding area.5. The programme was so exciting that the children kept their eyes on the screen.[高考题型练习提能力]Ⅰ.阅读理解I once saw a TV programme at college about a scientist who used “drift bottles (漂流瓶)” to mark ocean currents.It was a rather boring programme.I was more interested to read an article about someone who found a bottle on a beach with a messageinside.Like the drift bottles, it had been thrown into the sea-but 21 years before.I decided to find out more about such bottles,and I started work on this intriguing (非常有趣的)research.An early message in a bottle was thrown into the sea by Christopher Columbus during a terrible storm.He wrote about his discovery of America and expected that his message would be sent to the Queen of Spain.He wanted the news to reach her, but he thought he might be drowned (淹死) in the storm.In fact, he survived but the bottle was never found.I would be excited to find a message in a bottle,but in the 16th century, it could be dangerous.In those days, the British Navy (海军) used messages in bottles to send information about the enemy.When Queen Elizabeth Ⅰ found out that a boatman had opened a bottle containing one of these secret messages, she created a new job, Uncorker of Ocean Bottles.I was amazed to learn that anyone else who opened a bottle could be sentenced to death.It seems very strange to us now.A long time ago, before dating websites existed to help people find partners, a sailor in Sweden put this message in a bottle-“To someone beautiful and far away.” It was found by a young woman in Sicily.She answered the message-“I am not beautiful, but it seems a miracle (奇迹) I found your message.” They began to write letters to each other,and eventually got married.Nowadays it's easy to communicate with anyone anywhere in the world, but I think people will still go on throwing bottles with messages into the ocean and guessing where the winds and the waves will carry them.And how romantic it would be to find a bottle with a message inside!【语篇解读】本文是说明文。
阶段综合检测(一)Ⅰ.阅读理解(共15小题;每小题2分,满分30分)AHave you ever thought of joining a book club and buying new books through the post?Here at the International Book Club we already have many members buying books from us by mail.Immediate benefits(利益):·As a special offer,you may choose any reduced-price books from our new members' book list to the value of £6 in total (plus postage).·Tick(给……打勾) the box on your form to order a free watch.·If you reply within seven days,we will send you another free gift carefully chosen from our book list.·Order a DVD from the many on offer in our list,at half price.When you've joined:As a member.You'll enjoy savings of between 30% and 50% off the publisher's price on every book you buy,and what's more,they'll come straight to your door.Your free club magazine arrives once a month,to keep you up to date with the latest bestsellers.Being a member:All we are asking you to do while you are a member is to choose four books during your first year.After that,you can decide on the number of books you wish to take.In each of our monthly club magazines,we choose a Club Choice book—a work of fiction or a reference title which is especially worth buying,and which is offered at a special price.However,if you do not want this book,just say no in the space provided on the form.We will always send the book if we do not receive this.So,return your application form today,but hurry—it's not every day we can make you an offer like this.To apply to become a member,all you need to do is send us your first order from our book list.Please don't send any money now,as we will send you your bill with the books.【语篇解读】本文是应用文。
课时分层作业(九) Section Ⅰ、Ⅱ[语言知识练习固基础]Ⅰ.单句语法填空1.Social customs(custom) vary greatly from country to country.2.As is known,this kind of monkey is native to China.3.Seen(see) from the sunset,the sea looks so beautiful.4.Seriously damaged,the bridge is no longer in use.5.Only a minority(minor) of the students supported the idea of having extra classes in the evening.6.I haven't got a good sense of direction,so I easily get lost(lose).7.His money is always running out before the end of the month.8.Her glass broken(break),she couldn't see the words on the blackboard.9.However difficult it is,the problem must be settled in some way.10.More and more people choose to shop on the Internet as it offers a(n) variety(vary) of goods.Ⅱ.完成句子1.The wildlife park is home to(是……的家园) bears,wolves,and other wild animals.2.It can help people being healthy and full of energy(充满活力).3.I am frightened that he may have got lost in(迷失在) the mountain.4.They say she died after a witch put a spell on(对……施魔咒) her.5.This change could not have taken place(发生) without a solid industrial foundation.[高考题型练习提能力]Ⅰ.阅读理解American culture is unique because it is formed and developed under certain conditions.The major factors contributing to the making of this new nation and the forming of a new culture are the hard environment,ethnic diversity (多民族) and plural religion,which is quite different from other nations in the world.What is more,these elements are still influencing the American culture.The early immigrants who were English Puritans settled down in northeast part of America.From 1607 to 1892,frontiers were pushed further west.The frontiersmen (拓荒者) looked for a land of rich resources and a land of promise,opportunity and freedom.Actually they looked for a better life.So individualism (个人主义),selfreliance,and equality of opportunity have perhaps been the values most closely associated with the frontier heritage (遗产) of America.In history,people from different countries in the world rushed to America three times.They brought their own culture to America and later on,different cultures were mixed together.Thus the unique American culture is formed,a common cultural life with commonly shared values.The fundamental American belief in individual freedom and the fight of individuals to practice their own religion is at the center of religious experience in the United States.The great diversity of ethnic backgrounds has produced religious pluralism (多元化) ;almost all of the religions of the world are now practiced in the United States.Nowadays,we can see the continual influence of the three elements in the current American society.American family is typically parents and their unmarried children.Middleaged and elderly people generally do not live with their married children.The people in America have a very strong desire to start a new life in a new place.Quite a number of people change residences every year.The average American moves fourteen times in his lifetime.【语篇解读】 本文主要从三个方面说明了美国独特文化产生的原因。
课时分层作业(九)Ⅰ.阅读理解When I was a child growing up in Ohio, the butterflies would sometimes pass through on their way to Mexico. And it was awesome to see football fields full of them-and I wanted to revisit that on a larger scale. I knew I had to go to see the migration(迁徙) in Mexico.But I was on a budget. I didn't want to rent a car in Mexico or take a bus to Valle de Bravo, the starting point for most butterfly adventures, so I called the guys at The Muddy Boot, travel experts in Mexico who can make almost anything happen at a reasonable rate.And so, on January 2, I found myself in The Muddy Boot van (面包车) , being driven for two hours from Mexico City to Valle de Bravo, a lovely town on a volcanic lake which is a central point for the butterfly journeys. I booked a twonight stay at the Hotel Rodavento, an all ecofriendly hotel with individual wooden houses spreading throughout the forest and around a lake.The first sanctuary (保护区) I visited was Piedra Herrada, a popular destination, as it is only 40 minutes away from Valle de Bravo. The climb up is tiring. It is advisable to hire a horse. But the horse cannot take you all the way, and there is some hiking in thin air, so you must be patient, drink a lot of water, and be in reasonably good shape.The walk is more than worth it though. As I struggled to catch my breath, I looked up and lost my breath again. At first glance, the trees had turned into different shapes, but on closer inspection, every inch of them was covered with butterflies.A few flew through the air (Most of them were not warm enough). As the sun rose, they began to come alive. Soon the air was filled with flying butterflies, transforming the forest into something magical and straight out of a fairy tale.【语篇解读】 本文是一篇日志形式的记叙文,作者讲述了自己为参观大规模的蝴蝶迁徙的美景而搭车前往墨西哥的一个城镇的故事。
课时分层作业(九)[语言知识练习固基础]Ⅰ.单句语法填空1.Traveling during the May holiday can be more stressful (stress) than work!2.Helping a blind man is an act of kindness (kind).3.Men and Women must be treated equally(equal) in education and employment.4.The country has been at war with its neighboring country for five years.5.My teaching style is similar to that of most other teachers.6.If children are badly brought up,they behave badly.7.We were put in a position where we had to answer violence with violence.8.I haven't received the new bag ordered (order) from the net shop last week.9. She wanted to work for a bigger and more influential (influence) newspaper.10.I don't know the reason why you were absent from the meeting,but I'm sure it's for some reason,I don't want to know it.Ⅱ.完成句子1.比赛被推迟的原因是正在下大雨。
课时分层作业(八)Ⅰ.单词拼写1.The chart shows an up________(趋势) of meat prices.2.The parents________(记录) every step of their child's development.3.So far Internet has become the main channel through which the computer________(病毒) spread.4.Sometimes an________(附件) with a nice name in your mail can be very dangerous.5.If your computer shows such information, it warns you that you are________(感染).6.The young teacher infected the whole class with her________(热情).7.Patience combined with________(勤奋) is necessary to success.8.Soon he was________(淹没,消失) up in the noisy crowd.9.He has finished the reading of the book, but he has not________(消化) it.10.England is________(接壤) on the north by Scotland.【答案】 1.trend 2.documented 3.viruses 4.attachment 5.infected 6.enthusiasm 7.diligence8.swallowed9.digested10.boundedⅡ.阅读理解Talking plants might sound like characters in a fairy tale.But recent scientific studies have shown that plants communicate with each other and with other living things in a surprising number of ways.To understand them, scientists say, we just have to learn their language.Farmers are especially interested in what plants have to say.“Plants are able to communicate with all sorts of organisms(有机体).They can communicate with giant bacteria, with other plants and with insects.They do this chemically,” said Cahill, an Ecology Professor of the University of Alberta in Canada.Plant scientists are just beginning to understand this chemical “language”.Cahill says studies have shown, for example, that plants can evaluate conditions in their immediate environment and take appropriate actions.Plants have an ability, for example, to signal pain or discomfort caused by anything from temperature extremes to an insect attack.Jack Schultz, a professor of chemical ecology at the University of Missouri sayswhen a plant senses that it's being eaten, it cannot walk away from trouble; on the contrary, it will release a chemical vapor that alerts other plants nearby.“Their language is a chemical language, and it involves chemicals that move through the air, which are easily to be changed, and most of all are smells that we are familiar with, ” Schultz explained.“All plants responded to the attack by changing their chemistry to defend themselves, ” Schultz recalled.“But we were quite surprised to find that nearby plants also changed their chemistry to defend themselves, even though they were not part of the experiment.”Studies have also shown that plants under attack release pleasant chemicals.Those chemicals attract friendly insects that attack the pests eating the plant.In the end, plants' ability to communicate their needs-and our ability to understand them-could help farmers reduce the use of poisonous chemicals, cut operating costs and limit damage to the environment.【语篇解读】本文是一篇科普文。
课时分层作业(十一)[语言知识练习固基础]Ⅰ.单句语法填空1.Occupied(occupy) in doing my homework all day, I was very tired.2.Don't be discouraged! We have made a great breakthrough in a way.3.Hundreds of miners are still in danger, waiting to be rescued(rescue).4.The plane crashed into the mountain and Lara was the only survivor(survive).5.Before I had a chance to say a word, he had rushed out.6.The sudden death of the young famous writer made us shocked(shock).7.He has taught men and women of all ages and various nationalities(nationality).8.Badly wounded(wound) in his left leg, the soldier walked unsteadily.9.He stood behind the door, from where he could see everything in the room.10.Overlooked(overlook) from the top of the mountain, the city looks more beautiful at night.Ⅱ. 选词填空with abandon, declare against, last but not least, pick up, far from 1.Sam picked up some knowledge of the computer just by watching others working on it.2.The city council has declared against building the new road, which will affect the farm.3.Owing a private car is far from a dream for some Chinese peasants at present.4.At the party, they sang and danced with abandon, totally forgetting the troubles in their lives.5.Last but not least, more and more people are aware of the importance of psychological health.[高考题型练习提能力]Ⅰ.阅读理解John Nelson, 92, grew up in Michigan and volunteered for the army in 1945.The 18yearold managed to get accepted, despite being colorblind.He landed on the island of Iwo Jima in the first days of the American attack to take the island from the Japanese.Nelson fought day and night for 10 days before receiving a serious woundto his right arm.The other seven men in his squadron (中队) all died.American losses included 5,900 dead and 17,400 wounded.Nelson saw the American flag being raised on Mount Suribachi after the island was taken by the American forces.The arm would continue to trouble him the rest of his life.Suffering from anxiety and flashbacks, he was diagnosed with posttraumatic stress disorder (创伤后遗症).Al Elders was a Grandville farm boy.He joined the Navy and was stationed on Guam when the bombing of Hiroshima and Nagasaki on Aug.6 and 9,1945,basically ended the war with Japan.War often develops lasting friendships.But for the two World War Ⅱ veterans (老兵) living at Sunset Manor in Jenison, their friendship didn't begin until about a year and a half ago.One day,Elders noticed a man sitting at a cafeteria in the Sunset Village,and that was Nelson.Seeing his Marine cap,Elders thought they would have something to talk about.And they did.The war in the Pacific is a common bond.The two men later worked together to serve other residents (居民) at Sunset Manor.John began detailing cars during good weather and cleaning walkers in the winter.Elders became his advertising manager.They donated most of their incomes to the Wounded Warrior project.John is less mobile now and is in care at Sunset.Al continues to visit and to encourage his friend.A friend of Elders who traveled to Iwo Jima brought back a jar filled with sand from the rocky island.Elders sent the gift, along with his own wartime collections, to the Seabee Museum and Memorial Park.【语篇解读】两位二战老兵因为共同的战争经历而结下了深厚的友谊,虽然年事已高,仍然致力于服务社会。
课时分层作业(九) [语言知识练习固基础] Ⅰ.单句语法填空 1.One can gain a lot of experience while doing(do) a part-time job. 2.We didn't dare to make a sound for fear of waking the sleeping baby. 3.The President refused to answer(answer) further questions on the subject. 4.His age was evident in his gray hair and wrinkled(wrinkle) face. 5.Hearing the strange sound, the child was shaking with fear. 6.Cancer is caused by chemicals in the air we breathe(breath), the water we drink, and the food we eat. 7.The scene of the traffic accident is covered with blood and brains, which is extremely disgusting(disgust). 8.He was put into prison because he murdered(murder) an old lady. 9.It is expected that the bridge will have been completed by next April. 10.Seeing terrified people trying to get out of a burning building, he stood there, terrified.(terrify) Ⅱ.选词填空 for the first time, burn out, contrast with, throw oneself on, again and again 1.It's normal for you to feel nervous when you went on the platform for the first time. 2.His actions contrast sharply with his promises. 3.The hotel was completely burnt out; only the walls remained. 4.I have explained again and again, but even now they do not understand. 5.I felt a bit tired after a long trip. So I threw myself on the couch and fell asleep soon. [高考题型练习提能力] Ⅰ.阅读理解 When European settlers arrived in North America, they brought European diseases with them.Then, huge numbers of Native Americans began dying from smallpox (天花) infection.Five-hundred-year-old documents record this tale, but now scientists say they've found other evidence buried deep inside human cells. In a new study,Brendan O'Fallon and Lars Fehren Schmitz report evidence found in genes that the Native American population dropped by half after the arrival of Europeans.O'Fallon studies genes at ARUP Laboratories in Salt Lake City, while Fehren Schmitz is a scientist who studies humankind, at the University of Gottingen in Germany. Cells make up every part of the body.Deep inside almost every cell is a long,coiled molecule (盘绕颗粒) called DNA.Genes are parts of DNA that play important roles in determining one's life.Genes help determine a person's appearance, such as skin color and height, and also play a role in many things you can't see, like the chance of getting a disease. Genes change over time, and by following these changes scientists can learn about a person's ancestors.O'Fallon and Fehren Schmitz looked at genes in the mitochondria of cells.(Mitochondria are like factories that help cells use energy from food.) The scientists compared DNA from the remains of ancient Native Americans with DNA from living people descended (遗传) from Native Americans. The scientists studied patterns in the genes from the two groups and identified ways that the patterns changed over time.Using statistics, which includes useful mathematical tools for analyzing large amounts of data, the researchers were able to judge the size of the Native American population before and after the Europeans' arrival.The comparison showed the number of native people reduced sharply after European settlers landed in the New World. Earlier genetic studies didn't have evidence of the Native American die-off.Scientists involved in the new study say that there's now more data from ancient remains, so researchers can get a better idea of what happened. 【语篇解读】 基因承载了人类遗传密码,是随时间的推移而不断变化的。通过对基因的分析和研究,人们可以解开很多秘密。 1.When European settlers arrived, they brought to North America. A.smallpox disease B.old documents C.other evidence D.a new study A [细节理解题。根据第一段“When European settlers arrived in...dying from smallpox(天花)infection.”可知欧洲殖民者进入北美洲时,也带去了传染病,所以A项正确。] 2.Genes help determine many things of a person EXCEPT . A.a person's appearance B.a person's skin color C.a person's height D.a person's success D [细节理解题。根据第三段“Genes help determine a person's...chance of getting a disease.”可知基因可决定一个人的外表、肤色、身高,或得某种疾病的可能,而不是一个人的成功。所以D项正确。] 3.The scientists got the result of the study by . A.following genes' change over time B.studying genes of ancient people C.analyzing large amounts of data D.finding out genes in the cells C [细节理解题。根据第五段“Using statistics,which includes...Europeans' arrival.”可知通过分析对比数据,得出欧洲人到美洲前后美洲居民的数量,从而得出最后的结论。所以C项正确。] 4.What can be the BEST title of this passage?