吉林省实验中学2020-2021学年度高三年级第四次诊断考试英语试卷

在第I卷（选择题，共56分）一、单项选择题（本题共8小题，每题只有一个选项符合题意，每题4分，共32分）1．2017年，人类第一次直接探测到来自双中子星合并的引力波。

根据科学家们复原的过程，在两颗中子星A和B合并前它们相距L，绕二者连线上的某点每秒转动n圈。

合并前将两颗中子星都看作是质量均匀分布的球体，A和B的质量之比为k，并且它们各自的运动都看做是匀速圆周运动，下列说法中正确的是A．中子星A和B的运动周期均为nB．中子星A和B的角速度大小之比为1:1C．中子星A和B的向心力大小之比为1/kD．中子星A和B的线速度大小之和为πnL2．汽车以8 m/s的速度在马路上匀速行驶，驾驶员发现正前方12 m处的斑马线上有行人，于是刹车礼让，汽车恰好停在斑马线前，假设驾驶员反应时间为0.5 s。

汽车运动的v - t图像如图所示，则A．反应时间内汽车发生的位移为8 mB．匀减速至停止的过程中汽车发生的位移为4 mC．汽车匀减速阶段的加速度大小为4 m/s2D．从驾驶员发现行人到汽车最终停止的整个运动时间为2 s3．用卡车运输质量为m的匀质圆筒状工件，为使工件保持固定，将其置于两光滑斜面之间，如图所示。

两斜面I、Ⅱ固定在车上，倾角分别为37°和53°，取sin37° =0.6，重力加速度为g。

当卡车沿平直公路匀速行驶时，圆筒对斜面I、Ⅱ压力的大小分别为F1、F2，下列说法中正确的是A．圆筒对斜面I的压力F1 = 45 mgB．圆筒对斜面I的压力F1 = 54 mgC．圆筒对斜面Ⅱ的压力F2 = 53 mgD．斜面I、Ⅱ对圆筒共同的作用力为75 mg吉林省实验中学2020-2021学年度高三年级第三次诊断考试物理试卷出题人：王海全审题人：于宗源v/m∙s-10 0.584． 如图所示，在水平方向的匀强电场中，一长为L 的绝缘细线的一端固定在O 点，另一端系一带正电的小球，小球在竖直平面内做完整的圆周运动。

2020-2021学年中国人民大学附属中学西山学校高三英语第四次联考试题及答案解析第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项ACharlie Thorne and the Last Equationby Stuart GibbsThe CIA is on a task to find an equation (方程式) called Pandora, which could destroy the world if the wrong people get it. For help, they turn to Charlie, a 12-year-old girl who's as smart as Albert Einstein. People who like action-packed mysteries will enjoy reading this exciting book.AstroNutsby Jon Scieszka and Steven WeinbergIn AstroNuts, the Earth has been destroyed by humans for thousands of years. Four animals set out from Mount Rushmore, the headquarters (总部) of NNASA. Their task is to find a new planet fit for human life. Finally, they discover one: Plant Planet. The story's theme (主题) is simple: Don't harm the planet. Readers who love fantasy will enjoy AstroNuts.Stargazingby Jen WangChristine hears that Moon, who's new in town, is the kind of kid who beats people up for fun. But Moon and her mum come to live with Christine's family, and the two kids become best friends. Moon even shares a big secret with Christine. Stargazing is based on author Jen Wang's experiences as a child. The story is about the power of friendship and how people are able to change.Roll with Itby Jamie SumnerRoll with It is a story about a 12-year-old girl named Ellie. She has difficulty walking on her own and uses a wheelchair. When Ellie and her mum move to another state to take care of Ellie's grandpa, she must learn to navigate (处理) a new school and new friendships. This page-turner is a must-read for everyone. It's a heartwarming story that really shows the value of familyand how being different is special.1. Which book tells readers to protect the place we live in?A.AstroNutsB.Stargazing.C.Roll with It.D.Charlie Thorne and the Last Equation.2. What makes Stargazing different from the other three books?A. It talks about friendship.B. It tells stories about animals.C. It contains lots of scientific knowledge.D. It was written according to the author's experiences.3. What happened to Ellie?A. She had difficulty in making friends.B. She had an accident which left her in a wheelchair.C. She went to a new school and had to start all over again.D. She lost her mum and was taken care of by her grandpa.BThere are three of us in the laboratory: Jules, me and Dr. Leonards. Leonards asks me to sit in front of Jules. As I do, he looks me in the eye and starts to move his face through a series of emotions-happy, confused, surprised, glaring. I'm attracted by his display, feeling delight when hegrinsand feeling serious when his eyes narrow angrily. None of this would be a surprise, of course, if Jules were a human. But he's a robot head on a table.The most special thing is that, consciously(有意识地), there's no mistaking Jules for a real person. Although he has surprisingly realistic skin, his eyes don't fit firmly against his lids, and he has a terrible hairpiece. Yet, as I walk into the room, I experience a complex worry of feeling in his direction. It's not at all like entering an empty space. It's a bit awkward for Jules’ shining false hair. Some unconscious part of me is responding to him as if he's real. This matters, because if we're to one day live comfortably along with robots , an understanding of how we instinctively(本能地) react to them is significant. The study of these issues is the frontier of a new scientific research; human-robot interaction.Jules was built as part of an attempt to understand the emotions that can be communicated by a human. “All the robots we'vebuilt so far don't have that rich emotions. We wanted to build a robotic face, with small motors that mimic(模仿) all the muscles you have, so we could discover what it could express. "Such research is becoming increasingly important, says Dr. Leonards, partly because our rapidly ageing population will soon need the help ofrobots with which they can effortlessly interact.4. What does the author think of Jules?A. He ignored him in his place.B. He didn't treat him as only a robot.C. He was afraid of his being there.D. He mistook him for a real person.5. What is the purpose to build such a robot?A. To help humans of old ages.B. To carry out a scientific research.C. To take the place of human labour.D. To make an interaction with human.6. What doesthe underlined word “grins” mean in Paragraph1?A. Smiles.B. Shakes.C. Worries.D. Cries.7. What may be the best title for the text?A. Human And RobotB. Success Of Making A RobotC. Robot Will Replace ManD. Difference Between Man And RobotCAdvertisers tend to think big and perhaps this is why they're always coming in for criticism. Their critics(批评家)seem to hate them because they have so much money to throw around. Why don’t they stop advertising and reduce the price of their goods? After all, it’s the consumer who pays.The poor old consumer! He'd have to pay a great deal more if advertising didn't create mass markets for products. It is precisely because of the heavy advertising that consumer goods are so cheap. But we get the wrong idea if we think the only purpose of advertising is to sell goods. Another equally important function is to inform. A great deal of the knowledge we have about household goods is largely from the advertisements we read. Advertisements introduce us to new products or remind us of the existence of ones we already know about. Supposing you wanted to buy a washing machine, it is more than likely you would obtain details regarding performance, price, etc., from an advertisement.Lots of people pretend that they never read advertisements, but this claim may be seriously doubted. It is hardly possible not to read advertisements these days. And what fun they often are, too! Just think what a railway station or a newspaper would be like without advertisements. Would you enjoy gazing at a blank wall or reading railway byelaws while waiting for a train? A cheerful, witty advertisement makes such a difference to a dull wall or a newspaper full of the incidents and disasters.We must not forget, either, that advertising makes a positive contribution to our pockets. The fact that wepay so little for our daily paper, or can enjoy so many broadcast programmers is due entirely to the money spent by advertisers. Just think what a newspaper would cost if we had to pay its full price!Another thing we mustn't forget is the “small ads.” What a tremendously useful service they perform for the community! Just about anything can be accomplished through these columns. For instance, you can find a job, buy or sell a house, announce a birth, marriage or death in what used to be called the “hatch, match and dispatch” column(栏目) but by far the most fascinating section is the personal or “agony” column. No other item in a newspaper provides such entertaining reading or offers such a deep insight into human nature. It's the best advertisement for advertising there is!8. What is the main idea of this passage?A. Advertisements steal money from our pocketsB. The critics get the wrong idea of advertisements.C. Advertisers perform a useful service to communities.D. Advertisements are everywhere.9. What is the attitude of the author toward advertisements?A. He appreciates the role of advertisements.B. He doubts the effect of advertisements.C. He believes what is said in advertisements.D. He complains too many advertisements in daily life.10. Which of the following is Not True?A. The personal or “agony” column makes us know more about human nature.B. The only purpose of advertising is to sell goods.C. A newspaper will cost us more if there is no advertisement on it.D. Advertisement makes our life color1 ful.11. Whicof the following shows the structure of the passage?( ①=" Paragraph" 1, ②=" paragraph" 2, ③=" paragraph" 3, ④=" paragraph" 4 ⑤=" paragraph" 5)A B.C. D.DPreventing heart disease is a topic I think about all the time, given my family history of heart disease. So last summer, I travelled toBolivia.The natives, called the Tsimane, were reported to have the healthiest hearts in the world. I wanted to learn what they could teach me about preventing heart disease.Getting to the Tsimane wasn't easy. They lived in small family groups of about 60 people along river banks. We finally found one of the villages at sunset. That night, we set up our tents in the middle of the village. Thatched huts surrounded us, with no electricity or modem conveniences.At first, I thought they mainly got their calorics from meat. However, I found food such as rice and com made up nearly 70% of their diet. The food was not processed, lacking added sugars or salts.During my stay there, I went hunting and fishing with the men and played soccer with the kids. I found the Tsimane were standing or walking nearly all of their waking hours. Men spent lots of time tracking animals. Fanning and gathering, mostly done by children and women, were all-day affairs.I also got a clear idea of how they rested. As soon as the sun went down, people returned to their huts and went to sleep. And with the call of the cock in the morning, another day began.The lifespan of the Tsimane is actually much shorter than those living in theUS. Various factors, like animal attacks and infections, bring down the lifespan. But up until the day they die, they are often very healthy. While heart disease kills thousands of Americans every year and costs nearly a billion dollars a day, the Tsimane remind us that wealth doesn't necessarily buy health.12. Why does the author pay so much attention to preventing heart disease?A. He dreams of becoming a doctor.B. He wants to teach others about the topic.C. His family members encourage him to do so.D. He was born with a high risk of heart disease.13. Which factors did the author mainly focus on in his research?A. Housing, food and cooperation.B. Diet, activity and rest.C. Physical work, social life and lifespan.D. Group size, family history and consumption14. What was the Tsimane 's sleep-wake cycle mainly based on?A. Natural sound.B. Routine activity.C. Animal behaviour.D. Natural light.15. What might the author advise us to do after his travels inBolivia?A. Take in less sugar and salt.B. Stand less and walk more.C. Eat white meat instead of red meat.D. Live in the middle of the community.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

2020-2021学年上海师范大学第四附属中学高三英语期中考试试题及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AThere have been many great painters in the rich history of Chinese art. Here are four of the greatest painters from China.Li Cheng (919—967, Five Dynasties and early Song Dynasty)Li Cheng contributed greatly to one of the golden ages of landscape paintings in world history. During his time, he was considered the best landscape painter ever. He is remembered especially for the winter landscapes he created and for simple compositions of tall, old evergreens set against a dry landscape. Several of his paintings are in thin ink which gives them a foggy appearance.Fan Kuan (990—1020 , Song Dynasty)Fan Kuan began his career by modeling Li Cheng's work but later created his own style, claiming that the only true teacher was nature. His finest workTravelers among Mountains and Streamsis a masterpiece of landscape painting and many future artists turned to it for inspiration.Qi Baishi (1864-1957)One of the greatest contemporary Chinese painters, Qi Baishi is known for not being influenced by Western styles like most painters of his time. He can be considered as the last great traditional painter of China. He painted almost everything from insects to landscapes. He is regarded highly in Chinese art for the freshness that he brought to the familiar types of birds and flowers, insects and grass.Wu Guanzhong (1919—2010)Widely considered as the founder of modern Chinese painting , Wu Guanzhong has painted various aspects of China, like its architecture, plants, animals, people and landscapes. Wu went on to combine Western and Chinese styles to create a unique form of modem art. In 1992, he became the first living Chinese artist whose work was exhibited at the British Museum.1.What do we know about Li Cheng?A.He loved landscape paintings.B.He copied many artists' work.C.His work gained worldwide recognition.D.He was considered as Fan Kuan's teacher.2.What is the main feature of Qi Baishi's paintings?A.They have foggy appearances.B.They lack diversity in the theme.C.They come under Western influence.D.They show advanced traditional painting skills.3.What did the four Chinese painters have in common?A.They were all modern painters.B.They all created landscape paintings.C.They were all impacted by Western art.D.They were all pioneers intraditional art history.BDepression（抑郁症）in young adult males, ages 18 or 19, is linked to a 20% greater risk of having a heart attack in middle age, according to a new Swedish study.The link can be partly explained by poorer stress resilience（抗压能力）and lower physical fitness among teens with mental disorders.Theresearch included 238,013 men born between 1958 and 1962 who were given examinations in adolescence（青春期）and were then followed into middle age（up to the age of 58 years）. A total of 34,503 men were diagnosed（诊断）with a mental disorder.The study found thata mental disorder in young adulthond was linked to a higher risk of having heart attack by middle age. Compared to men without a mental illness in young adulthood，the risk of heart attack was 20%higher among men with a diagnosis.“We already knew that menwho were physically fit in adolescence seem less likely to keep fitness in later years if they have low stress resilience” said study author Dr. Bergh, “Our research has also shown that low stress resilience is also connected with a greater tendency towards bad behavior, such as higher risks of smoking, drinking and other drug use.”“Better fitness in adolescence is likely to help protect against later heart disease, particularly if people stay fit as they age. Physical activities may also reduce some of the bad effects of stress. Those in poor health could benefit from additional support to encourage exercise and develop plans to deal with stress,” said Bergh.4. How does the author develop paragraph 3?A. By giving examples.B. By listing figures.C. By making a comparison.D. By drawing a conclusion.5. What are men with low stress resilience likely to do?A. Smoke more.B. Eat more.C. Sleep less.D. Do less exercise.6. What will Bergh agree with according to the last paragraph?A. Physical activitiesadd to stress.B. Stress may cause heart disease.C. Taking exercise is unnecessary.D. Staying fit is of great importance.7. In which section of a newspaper may this text appear?A. Entertainment.B. Health.C. Education.D. Fashion.CI come to theUnited Statesten year ago. I would always say that I was trying to study, but there were always things like work and my kids that would not allow me to start.Now I realized that those were only excuses. What stopped me was that I was afraid to start studying again. I always believed I would learn by myself.One day, however, my son told me that he was sad because his friends would come over and I didn’t understand them because I didn’t speak English. He was also sad because I could never help him with his homework. That same day, I told myself, “Rocio, you have to start believing in yourself and you will see you can make it.”The next day, I went downtown to look for a big banner (横幅) in front of the school which said that they offered classes for adults. I came in to see if I could join, but the classes were closed already. That night I took the kids to the movies, and on the way back, I told them we would take a new route. I ended up getting lost. That’s the way I foundChaffeyCollege. The following Monday, I went to ask for information. They told me that summer school was starting that week.That’s how I started studying English last summer. It is difficult, but I have had great rewards. My daughter had to write a story for school. It was about the female they most admired and why . She wrote that I was the person she most admired because I had started going to College. I will never forget this.8. According to the passage, the author probably is a .A. teacherB. doctorC. fatherD. mother9. What made the author make up her mind to study English?A. What her son said.B. What her daughter said.C. Thinking about herself.D. Thinking about her daughter.10. How did they findChaffeyCollege?A. On the way to the movies.B. They took a new route and got lost.C. Ask a stranger for information.D. According to the banner.11. Which of the following is NOT true?A. The author came to theUnited Statesfrom another country.B. The author had two children at least including one daughter.C. What really changed the author’s life was she believed in herself.D. The author wrote that she was the person her son most admired.D36-year-old Juan Dual likes to joke that he’s empty inside. Juan’s story began when he was only 13. It was then that he was diagnosed with a terrible disease, which left him with a 99.8% chance of developing cancer of the digestive system. At age 19, right after finishing high-school, Juan underwent a tough operation to take away his colon and rectum. Sadly, it was only the beginning. By age 28, Juan’s disease had affected his stomach and gallbladder so he had to go under the knife again.Having just recovered from several serious surgeries, Juan Dual decided to accept the invitation of some friends of his parents and travel to Japan. It was there that things started to change for the better. He didn’t speak a word of Japanese, so he spent most of his time walking his dog. One day, the dog pulled harder, and Juan realized that he was still able to jog, and he started to do just that.Months later, he found himself working in a small, peaceful town in England. There was little in terms of entertainment, but the town was surrounded by hills, so he devoted even more of his time to running. He befriended some like-minded folks and told them what he’d been through, and they seemed amazed at the fact that he was still alive, let alone that he was pushing himself to exercise. That’s when the idea of focusing on motivating others took root in his mind.With the help of Pepa, a nutritionist, Juan Dual slowly relearned how to eat to keep his energy level highenough to sustain him during physical activity. Eight months after his last operation, he finished the Barcelona half marathon in two hours. He then started training for mountain running and ultra-marathons.12. Why does Juan Dual say he is empty inside?A. Because he has no desire for anything.B. Because he doesn’t have much knowledge.C. Because he always suffers from great hunger.D. Because many of his organs have been removed.13. What made Juan Dual aware that he could still run?A. His parents’ support.B. A walk with his dog.C. The idea of challenging himself.D. His quick recovery from surgeries.14. When did Juan Dual decide to inspire others with his story?A. After finishing the Barcelona half marathon.B After being introduced to a nutritionist named Pepa.C. After sharing it with his friends in an English town.D. After making friends with people with similar sufferings.15. Which of the following words can best describe Juan Dual?A. Ambitious and intelligent.B. Inspiring and responsible.C. Unfortunate but determined.D. Confident but stubborn.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

2020～2021学年度上学期期中教学质量检测试卷九年级英语（考试时间：120分钟；满分：120分）注意事项：1.答题前，请认真阅读试卷和答题卡上的注意事项；2.本试卷分为第Ⅰ卷（选择题）和第Ⅱ卷（非选择题）两部分。

答第Ⅰ卷时，用2B铅笔把答题卡上对应题目第．1．～．70．．小题的答案标号涂黑．．．．．．．．．；答第Ⅱ卷时，用直径0.5mm黑色字迹签字笔将答案写在答题卡上，在本试卷上作答无效；3.考试结束后，将试卷和答题卡一并交回。

第Ⅰ卷选择题（共三部分，满分90分）第一部分听力理解(共四节，满分30分)第一节听音辨图（共5小题，每小题1分，满分5分）请听下面五个句子，每个句子后有一个小题，从题中所给的A、B、C三个选项中选出与所听句子内容相符的图画。

听完每个句子后，你将有10秒钟的时间来回答有关小题和阅读下一小题。

每个句子仅读一遍。

1. A. B. C.2. A. B. C.3. A. B. C.4. A. B. C.5. A. B. C.第二节情景反应（共5小题，每小题1分，满分5分）请听下面五个句子，每个句子后有一个小题，从题中所给的A、B、C三个选项中选出最佳的答语。

听完每个句子后，你将有10秒钟的时间来回答有关小题和阅读下一小题。

每个句子仅读一遍。

6. A. Not at all. B. I want to buy a shirt. C. Sorry, I don’t know.7. A. That’s all right. B. Thank you. C. The same to you.8. A. By car. B. At 7:30 p.m. C. The No. 8 bus.9. A. Yes, that’s great. B. Yes, it is. C. Yes, what about you?10. A. That’s right. B. Don’t mention it. C. Sorry, you’d better not.第三节对话理解（共10小题，每小题1分，满分10分）请听下面六段对话，每段对话后有一至三个问题，根据对话内容从题中所给的A、B、C三个选项中选出最佳选项。

2020-2021学年山东省实验中学高三（上）第三次诊断英语试卷第一部分听力（共两节，满分7.5分）做题时，先将答案标在试卷上。

录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。

第一节（共5小题；每小题1.5分，满分7.5分）听下面5段对话。

每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1．（1.5分）Where will Mike do the cleaning？A. In the kitchen.B. In the living room.C. In the dining room.2．（1.5分）What does James mean？A. They can make a detailed plan.B. He will make a decision at the last minute.C. The woman should have invited him earlier.3．（1.5分）What are the speakers going to do next？A. Book seats.B. Have a rest.C. Take another flight.4．（1.5分）What did the tour guide help the guy do？A. Carry his suitcase.B. Arrange a long tour.C. Find his passport.5．（1.5分）How will the woman go to the show？A. By subway.B. By taxi.C. By bus.第二节（共5小题；每小题1.5分，满分22.5分）听下面5段对话或独白。

每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

2020-2021学年度第一学期教学质量检测小学三年级英语科试卷（满分：100分；答题时间：40分钟）题号一二三四五六七八九十十一十二十三总分得分听力部分（50分）一、听录音，写出字母的大写形式并在下面的括号里写出其笔画数。

（10分）1. 2. 3. 4. 5.（）（）（）（）（）二、听录音，根据读音写字母补全单词并与图片连线。

（10分）1.pple2.and3.og4.ag5.anda三、听录音，选出你所听到的选项。

（8分）（）1.A.red B.bread C.leg（）2.A.black B.brown C.blue（）3.A.bird B.bag C.blue（）4.A.I B.L C.J（）5.A.B B.P C.D（）6.A.Good morning. B.Good afternoon. C.Goog-bye.（）7.A.I have a cat. B.I have a bag. C.I have an egg.（）8.A.Show me ten. B.Show me your pen. C.Show me seven.四、听句子标号。

（6分）五、听录音，根据录音内容帮助格林先生写出各车牌号码。

（4分）（1）（2）（3）L25113（4）（5）六、听读对话，给下面的图片标号。

（5分）（）（）（）（）（）七、听录音，选择正确的答语。

（7分）（）1.A.I’m eight. B.I have a pencil. C.Eight.（）2.A.It’s a cat. B.It’s green. C.I have a cat.（）3.A.I’m fine. B.I’m nine. C.I’m Mike.（）4.A.Thank you. B.No,thanks. C.Here you are.（）5.A.Here you are. B.Thank you! C.I have some milk.（）6.A.My name’s Amy. B.This is Amy. C.Hi,Amy.（）7.A.Hello,Miss Green. B.Good morning,Miss White.C.Goodbye,Miss White.笔试部分（50）八、读一读，连一连。

2020-2021学年高三英语第四次联考试卷及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AConservation Volunteering in New ZealandWhether you are a student, professional or a retiree (退休者), anyone is welcome to make a difference and contribute to protecting some of the most beautiful islands in the world. Choose a suitable city and travelout to your conservation (保护) site to work with local people!Duration: 1-12 weeks Dates: Throughout the yearArrival day: Friday Return day: FridayRequirement: General level of fitness Age: 18+What will I be doing?Volunteer in New Zealand and enjoy conserving the environment through activities such as:·Tree planting·Walking trail construction·Protect native birds, insects, fish and penguins·Seed collection·Weed controlYou, and a group of up to 10 volunteers, will work under the guidance of a conservation team leader. Your team leader will give you regular safety instructions, inform you of the project aims and assist you with working effectively.No previous experience is necessary to join the project. All you need is a love of the environment and a fairly good level of fitness to help out!1.Who can sign up for this conservation volunteering project?A.A retired maths teacher.B.A primary school student.C.A scientist with heart disease.D.A businessman in a wheelchair.2.What can you do on the volunteer trip?A.Protect cultural sites and go shopping.B.Enjoy local sightseeing and go fishing.C.Protect weeds and build roads.D.Collect seeds and plant trees.3.From which is the text probably taken?A.A history book.B.A travel magazine.C.A research paper.D.A novel.BWhy isn’t science better? Look at career incentive(激励).There are oftensubstantial gaps between the idealized and actual versions of those people whose work involves providing a social good. Government officials are supposed to work for their constituents. Journalists are supposed to provide unbiased reporting and penetrating analysis. And scientists are supposed to relentlessly probe the fabric of reality with the most rigorous and skeptical of methods.All too often, however, what should be just isn’t so. In a number of scientific fields, published findings turn out not toreplicate(复制), or to have smaller effects than, what was initially claimed. Plenty of science does replicate — meaning the experiments turn out the same way when you repeat them -but the amount that doesn’t is too much for comfort.But there are also waysin which scientists increase their chances of getting it wrong. Running studies with small samples, mining data for correlations and forming hypotheses to fit an experiment’s results after the fact are just some of the ways to increase the number of false discoveries.It’s not like we don't know how to do better. Scientists who study scientific methods have known about feasible remedies for decades. Unfortunately, their advice often falls ondeaf ears.Why? Why aren't scientific methods better than they are? In a word: incentives. But perhaps not in the way you think.In the 1970s, psychologists and economists began to point out the danger in relying on quantitative measures for social decision-making. For example, when public schools are evaluated by students’ performance on standardized tests, teachers respond by teaching “to the test”. In turn, the test serves largely as of how well the school can prepare students for the test.We can see this principle—often summarized as “when a measure becomes a target, it ceases to be a good measure”—playing out in the realm of research. Science is a competitive enterprise. There are far more credentialed (授以证书的) scholars and researchers than there are university professorships or comparably prestigious research positions. Once someone acquires a research position, there is additional competition for tenure grant funding, and support and placement for graduate students. Due to this competition for resources,scientists must be evaluated and compared. How do you tell if someone is a good scientist?An oft-used metric is the number of publications one has in peer-reviewed journals, as well as the status of those journals. Metrics like these make it straightforward to compare researchers whose work may otherwise be quite different. Unfortunately, this also makes these numbers susceptible to exploitation.If scientists are motivated to publish often and in high-impact journals, we might expect them to actively try to game the system. And certainly, some do—as seen in recent high-profile cases of scientific fraud(欺诈). If malicious fraud is the prime concern, then perhaps the solution is simply heightened alertness.However, most scientists are, I believe, genuinely interested in learning about the world, and honest. The problem with incentives is that they can shape cultural norms without any intention on the part of individuals.4. Which of the following is TRUE about the general trend in scientific field?A. Scientists are persistently devoted to exploration of reality.B. The research findings fail to achieve the expected effect.C. Hypotheses are modified to highlight the experiments' results.D. The amount of science that does replicate is comforting.5. What doesdeaf earsin the fourth paragraph probably refer to?A. The public.B. The incentive initiators.C. The peer researchers.D. The high-impact journal editors.6. Which of the following does the author probably agree with?A. Good scientists excel in seeking resources and securing research positions.B. Competition for resources inspires researchers to work in a more skeptical way.C. All the credentialed scholars and researchers will not take up university professorships.D. The number of publication reveals how scientists are bitterly exploited.7. According to the author, what might be a remedy for the fundamental problem in scientific research?A. High-impact journals are encouraged to reform the incentives for publication.B. The peer-review process is supposed to scale up inspection of scientific fraud.C. Researchers are motivated to get actively involved in gaming the current system.D. Career incentives for scientists are expected to consider their personal intention.CRecycling plastic has always been a stop-start effort, and the wide variety of plastics we produce, the pollution from waste, and other limitations make recycling an economic(经济) problem. It’s estimated(估计)only 9%of plastic ever created has been recycled. But with the help of a chemical process, Canadian Miranda Wang and her company BioCellection want to change that.Stability is one of plastic greatest qualities and downside. There's limited evidence that some plastics can biodegrade (生物降解)but largely photo-plastics degrade in the sun. It’s a long process, and the truth is that we can only estimate how long it takes. Wang is looking to break the inaction and BioCellection's task is to make most plastic waste recyclable.She outlines two current methods. One is to take plastics like water bottles, wash them, cut them, melt and reconstitute them. “That's a very limited process” she says, due to the requirement that plastics be “clean” . The other, which can handle dirtier plastics and a level of pollution, is called hydrolysis(热解). Intense heat is applied to break down plastics so they can be reused as oils for energy, but “it’s not economical,’’ she says.BioCellection’s solution builds on research from over ten years ago, Wang explains, when a US studydiscovered pure polyethylene powder (聚乙烯粉)could be broken down by a catalyst (催化剂). Wang and her co-founder Jean hit upon a bacterium being able to eat plastic. In the years since, they engineered a comparable catalyst capable of doing the same job, only faster, which even works on plastics no one else can recycle at present. “We have now found a catalyst that is much cheaper than the one that was used before, Wang says.Currently focusing on plastic films like shopping hags, the three-hour process breaks clown plastic into chemicals that can act as the building blocks for more complex plastic products.“Right now we’re able to achieve about 70% transformation from plastic waste material to these chemicals,” she adds, saying they’re working to increase that figure.8. Why has so little plastic been recycled?A. Plastic is chemically stable.B. Recycling plastic led to pollution.C. We produced various plastics.D. Most photo-plastics degrade in the sun.9. What does Wang think of the two current methods?A. Highly effective and dynamic.B. Expensive and pollution-causing.C. Limited and energy-consuming.D. Widely used and recognized.10. What did BioCellection find effective to recycle plastics?A. Polyethylene powder.B. Chemical products.C. Plastic films.D. A catalyst.11. What is the text mainly about?A. Miranda Wang and her company.B. A new plastic recycling method.C. The greatest downside of plastic.D. Transformation of plastic waste.DANew Zealandcouncil has announced a month-long road closure in order to allow a sea lion and her pup to reach the ocean safely.John Wilson Ocean Drive in Dunedin will be closed after the New Zealand sea lions made their home at a nearby golf course and started "regularly crossing the road to get to the beach," according to a Facebook post from Dunedin City Council."You can still visit the area on foot or by bicycle, but please give the sea lions lots of space," continued the post.Locals applauded the decision, and one even called for the closure to be made permanent."No dogs should be on the beach, either," wrote Gaylene Smith. "We need to protect our beautiful sea life."Dogs are known to attack sea lions, and Chisholm Links Golf Course, where the sea lions have made their home, also posted advice to dog walkers in a Facebook update."We're lucky to have sea lions on our coastline and we need to share the space with them,as this is what makes our coastline so unique!" wrote the course on Facebook.The council went on to explain thatNew Zealandsea lions are endangered, and are one of the world's rarest species of sea lion.There are an estimated 12,000New Zealandsea lions left, according to the Department of Conservation. Under local law, anyone who kills a sea lion could face up to two years in prison or a fine of up to NZ$250,000(US$178,000).12. What decision has the Dunedin City Council made?A. Closing an ocean drive for a month.B. Forbidding entry into a golf course.C. Forbidding walking dogs outside.D. Closing the nearby beach temporarily.13. How did the City Council announce the decision?A. By informing on TV.B. By sending out notices.C. By posting on Facebook.D. By advertising in a newspaper.14. What is the attitude of the local people toward the closure?A. Doubtful.B. Supportive.C. Uncaring.D. Critical.15. What can we learn aboutNew Zealandsea lions from the text?A. They are afraid of humans.B. They are a common species.C. They are being killed by dogs.D. They are under legal protection.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

吉林省四平市第十七中学2020-2021学年高三英语下学期期末试卷含解析一、选择题1. Jose cupped his hands together to cover his face ______ other people wouldsee him cry.A. so thatB. for fear thatC. now thatD. on condition that参考答案：B2. Although _____of danger, tourists can't help taking photos near the cliff （悬崖）．A．having warned B．warned C．warning D．to be warned参考答案：B3. —I was wondering whether you could remember that name.—Oh, I’m afraid that _______ me for the m oment.A. remindsB. puzzlesC. disturbsD. escapes参考答案：D4. —Did you get home a little earlier yesterday?—No. It was six o’clock________ we got home.A. thatB. whenC. sinceD. after参考答案：B略5. If it had not been for the heroes’ contributions and sacrifices, we _____such a happy life.A. wouldn’t have ledB. wouldn’t be leadingC. haven’t ledD. are not leading参考答案：B【详解】考查虚拟语气。

句意：要不是英雄们的牺牲，我们如今不会过上如此幸福的生活。

2020—2021学年高三年级第二次质量检测化学试题测试时间：2020年10月1．本试卷分第I卷(选择题)和第Ⅱ卷(非选择题)两部分，第I卷1至4页，第Ⅱ卷5至8页。

满分100分，考试时间90分钟。

2．答题前，考生先将自己的学校、姓名、班级、准考证号填写在相应位置，认真核对条形码上的姓名、考生号和座号，并将条形码粘贴在指定位置上。

3．选择题答案必须使用2B铅笔(按填涂样例)正确填涂；非选择题答案必须使用0.5毫米黑色签字笔书写，字体工整、笔迹清楚。

4．请按照题号在各题目的答题区域内作答，超出答题区域书写的答案无效；在草稿纸、试题卷上答题无效。

保持卡面清洁，不折叠、不破损。

可能用到的相对原子质量：H 1 O 16 Na 23 C1 35.5 K 39 P 31 Mn 55 Fe 56一、选择题：本题共10小题，每小题2分，共20分。

每小题只有一个选项符合题目要求1．化学与生产、生活密切相关，下列说法错误的是( )A．北宋沈括《梦溪笔谈》中记载：“信州铅山有苦泉，流以为涧。

挹其水熬之则成胆矾，烹胆矾则成铜。

熬胆矾铁釜，久之亦化为铜”。

“熬之则成胆矾”是浓缩结晶过程B．水泥厂常用高压电除去工厂烟尘，利用了胶体的性质C．《本草经集注》对“硝石”的注解如下：“……如握雪不冰。

强烧之，紫青烟起，仍成灰……”。

这里的“硝石”指的是高锰酸钾D.《本草纲目》“烧酒”条目下写道：“自元时始创其法，用浓酒和糟入甑，蒸令气上……其清如水，味极浓烈，盖酒露也。

”这里所用的“法”是指蒸馏2．实验室中下列做法错误的是( )A．氯水通常保存在棕色细口瓶中并置于阴凉处KMnO具有氧化性，其稀溶液可用于消毒B．4C．用酒精灯直接加热蒸发皿D．用泡沫灭火器扑灭金属钾的燃烧3．下列叙述不涉及氧化还原反应的是( )A．谷物发酵酿造食醋B．小苏打用作食品膨松剂C．含氯消毒剂用于环境消毒D．大气中NO2参与酸雨形成4.下列气体去除杂质的方法中，不能实现目的的是( )5. N A 是阿伏加德罗常数的值。

2020-2021学年南昌第一中学高三英语期中考试试卷及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AOvernight French ToastWhat You’ll Need•16-ounce loaf of French bread•5 eggs•1 1 /2 cups milk•1/2 cup half-and-half•1/3 cup maple syrup（枫糖浆）•1/2 teaspoon salt•foil（锡箔纸）•2 tablespoons melted butter（for topping）•2 tablespoons maple syrup（for topping）What to Do•With an adult’s help, cut the bread into 1-inch slices.•Place the eggs, milk, half-and-half, maple syrup, and salt into a large bowl. Stir（揽拌）the mixture until blended（混合均匀）.•Place the sliced bread into a baking dish. Pour the mixtureover the bread and press the slices into it. Cover the dish with foil and refrigerate overnight.•Remove the dish from the refrigerator at least one hour before baking. Ask an adult for help to preheat the oven to 375°F. Bake the French toast for 35 minutes or until golden brown.•For the topping, combine the melted butter and 2 tablespoons of maple syrup. Pour it over the French toast before serving.1.How much salt will you need to make a French toast?A.1/3 cup.B.1/2 teaspoon.C.2 tablespoons.D.16 ounces.2.How will you use foil?A.Place the sliced breadB.Cover the dish.C.Remove the dish.D.Eat the French toast.3.Who is the passage written for?A.Teachers.B.Parents.C.Cooks.D.Kids.BIf you go into the forest with friends, stay with them. If you don’t, you may get lost. If you get lost, this is what you should do. Sit down and stay where you are. Don’t try to find your friends—let them findyou. You can help them find you by staying in one place. There is another way to help your friends or other people to find you. You can shout or whistle three times. Stop. Then shout or whistle three times again. Any signal given three times is a call for help.Keep up shouting or whistling. Always three times together. When people hear you, they will know that you are not just making a noise for fun. They will let you know that they have heard your signal. They will give you two shouts or two whistles. When a signal is given twice, it is an answer to a call for help.If you don’t think that you will get help before night comes, try to make a little house with branches(树枝). Make yourself a bed with leaves and grass.When you need some water, you have to leave your little branch house to look for it. Don’t just walk away. Pick off small branches and drop them as you walk in order to go back again easily. When you are lost, the most important thing to do is to stay in one place.4. If you get lost in the forest, you should _________.A. try to find your friends in no timeB. stay in one place and give signalsC. walk around the forestD. shout as loudly as possible5. Which signal is a call for help?A. Crying twice.B. Shouting here and there.C. Whistling everywhere in the forest.D. Shouting or whistling three times together.6. When you hear two shouts or two whistles, you know that _________.A. someone needs your helpB. something terrible will happenC. people will come to help youD. someone is afraid of an animal7. What’s the meaning of the last paragraph?A. Use branches to make a bed.B. Drop branches to look for water.C. Pick off branches to build another house.D. Leave branches to help you find your way back.CTwo young brothers fromMalden.Massachusettswere in the spotlight Thursday after being named “heroes" by a national organization that recognizes young people doing great things. For the Bennett brothers, the goal of their work is nothing less than helping researchers find a cure for cancer. And their inspiration came from a friend.Thirteen-year-old Hany Bennett and his nine-year-old brother Heath run their business out of their family kitchen. "We're making lip balm（润唇膏），"Harry says. They got the idea two years ago when their friend, Timmy, was diagnosed（诊断）with cancer. brothers wanted to do something. We learned that cancer patients（lips and skin can get really dry because of chemotherapy（化疗），Hany says.A light bulb went off in both of their young heads,and " Bennett Brothers Balm was born. "We make lip balm, which is kind of like our main product/ says Heath. They also make and sell different body balms, all natural, all handmade, while the profits benefit cancer research. "We've raised S 15,000/ Heath says.And with the great optimism of children, they don't just want to help；they wont to win. We want to find a cure. We want to help doctors find a cure, Harry explains, The brothers are also Gelding a team for the Light the Night Walk, to fight cancer."I think it's great to raise money and help people who have cancer," says Heath. Their parents play a big role as well, but it's the boys who provide the most enthusiasm with a message we can all learn from. "If you want to do something... do it," Harry says. "I just feel very glad that we're helping. It feels very good”，adds Heath.Harn and Heath just received the S 10,000 Gloria Barron Prize for Young Heroes. Hwy intend to save some of il for college, invest some of it in their business and give the rest to charity. And their friend Timmy? "He's doing great. He's all better, Harry says.8. What encouraged the Bennett brothers to make lip balm at first?A. Helping a friend with cancer.B. Finding a cure for cancer.C. Raising public awareness of cancer.D. Collecting money for cancer patients.9. What does the underlined part in Paragraph 3 mean?A. The two brothers finished their first product.B. The two brothers came up with an idea.C. The two brothers struggled for a stress-free life.D. The two brothers found an effective way to study.10. What do the Bennett brothers think of their work?A. It is quite competitive.B. It is well worthwhile.C. It fails to satisfy their parents.D. lt helps them make a big profit.11. What does the author intend to tell us with the two brothers' story?A. Great minds think alike.B. Two headsare better than one.C. Young kids can make a big difference.D. The longest journey begins with the first step.DOur house was across the street from a big hospital so we rented our spare upstairs room to outpatients (门诊病人). One evening, there was a knock at the door. I opened it to see a truly sick-looking man.His face looked terrible — it was swollen and red. Yet his voice was pleasant. He told me that he came for treatment and that he’d been hunting for a spare room since noon, but no one would give him one. “I guess it’s my face...”For a moment, I hesitated, but his next words convinced me: “I will sleep in this rocking chair on the porch. My bus leaves early in the morning.”The old man had a huge heart inside his tiny body. He told me that he fished for a living to support his daughter, his daughter’s five children and her disabled husband.He didn’t complain while telling me his story. He was grateful that no pain accompanied his disease, which was seemingly a form of skin cancer.The next morning, he said, “Can I come back and stay next time I need treatment?” I told him he was welcome to come again.On his next trip, as a gift, he brought a big fish and some large oysters (牡蛎). In the years that he stayed with us, there was never a time that he did not bring us gifts like these.My neighbour warned me that I could lose potential renters after the old man left.Maybe we did lose renters once or twice. But if they had known him, perhaps their illnesses would have been easier to bear. I know our family will always be grateful to have known him. From him, we learned what it was to accept the bad without complaint and the good with gratitude.12. Why did the author let the old man stay after hesitation?A. The old man looks terrible and frightening.B. The old man is pitifully undemanding.C. The old man could’t rent room from others.D. The old man talked happily with the author.13. Which of the following shows the old man had a big heart?A.He had a large family to raise.B. He could sleep in a rocking chair.C. He did’t care about his disease.D. He wanted to come back and stay the next time.14. What can we learn about the author from the last two paragraphs?A. He was grateful for the neighbour’s warning.B. He and his neighbor are good friends.C. He truly appreciated the old man.D. He lost potential renters happily.15. What can be a suitable title for the text ?A. Kindness makes the world beautiful.B. Happiness is around thecorner.C. No pains, No gains.D. Live positively.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

2020-2021学年吉林省第二实验学校九年级第一学期第四次月考数学试卷一、选择题（本大题共8小题，每小题3分。

共24分）1．在体育课的立定跳远测试中，以2.00m为标准，若小明跳出了2.35m，可记作+0.35m，则小亮跳出了1.85m，应记作（）A．+0.15m B．﹣0.15m C．+0.35m D．﹣0.35m2．截至北京时间10月11日6时30分左右，全球因感染新冠肺炎而死亡的病例约1070000例，105个国家确诊病例超过万例．携手抗“疫”，刻不容缓．数据1070000可以用科学记数法表示为（）A．0.107×107B．1.07×105C．1.07×106D．1.07×1073．如图是某个几何体的展开图，该几何体是（）A．三棱锥B．三棱柱C．圆柱D．圆锥4．不等式2x＞﹣2的解集在数轴上表示正确的是（）A．B．C．D．5．如图，某停车场入口的栏杆AB，从水平位置绕点O旋转到A'B'的位置，已知AO的长为3米．若栏杆的旋转∠AOA'＝α，则栏杆A端升高的高度为（）A．米B．3sinα米C．米D．3cosα米6．如图，点A，B，C，D在圆O，AC是圆O的直径，∠CAD＝26°，则∠ABD的度数为（）A．26°B．52°C．64°D．74°7．如图，在Rt△ABC中，∠ACB＝90°，根据尺规作图的痕迹判断以下结论错误的是（）A．∠DBC＝∠BDC B．AE＝BE C．CD＝AB D．∠BAE＝∠ACD 8．如图，在平面直角坐标系中，点A的坐标为（4，3），AB⊥x轴于点B，点C是线段OB 上的点，连接AC．点P在线段AC上，且AP＝PC，函数y＝（x＞0）的图象经过点P．当点C在线段OB上运动时，k的取值范围是（）A．0＜k≤6B．3≤k≤6C．3≤k≤12D．6≤k≤12二、填空题（本大题共6小题，每小题3分，共18分）9．笔记本每本m元，圆珠笔每支n元，买5本笔记本和7支圆珠笔共需元．10．分解因式y3﹣2y2+y＝．11．已知关于x的方程x2+2x﹣3a＝0有两个不相等的实数根，则a的取值范围是．12．二次函数y＝x2+2x﹣3图象的对称轴是，顶点坐标是．13．如图，在扇形OAB中，已知∠AOB＝90°，OA＝2，过的中点C作CD⊥OA，CE ⊥OB，垂足分别为D、E，则图中阴影部分的面积为．14．如图，在平面直角坐标系中，点A的坐标为（0，2），点B的坐标为（4，2），若抛物线y＝（x﹣h）2+k（h、k为常数）与线段AB交于C、D两点，且CD＝AB，则k 的值为．三、解答题（本大题共10小题，共78分）15．先化简，再求值：（x+3）（x﹣3）+x（4﹣x），其中x＝．16．有A、B两个不透明的盒子，A盒里有两张卡片，分别标有数字1、2，B盒里有三张卡片，分别标有数字3、4、5，这些卡片除数字外其余都相同，将卡片充分摇匀．（1）从A盒里抽取一张卡片、抽到的卡片上标有数字为奇数的概率是；（2）从A盒、B盒里各随机抽取一张卡片，请用列表或画树状图的方法，求抽到的两张卡片上标有的数字之和大于5的概率．17．从贵阳到广州，乘特快列车的行程约为1800km，高铁开通后，高铁列车的行程约为900km，运行时间比特快列车所用的时间减少了16h．若高铁列车的平均速度是特快列车平均速度的2.5倍，求特快列车的平均速度．18．如图，点C在以AB为直径的⊙O上，过点B作⊙O的切线，与AC的延长线交于点D．（1）求证：∠CBD＝∠BAC；（2）若∠CBD＝36°，⊙O的半径为5，则的长度＝．19．如图，▱ABCD的对角线AC、BD交于点O，M，N分别是AB、AD的中点．（1）求证：四边形AMON是平行四边形；（2）若AC＝6，BD＝4，∠AOB＝90°，求四边形AMON的周长．20．2020年3月，有关部门颁布了《关于全面加强新时代大中小学劳动教育的意见》，某地教育局发布了“普通中小学校劳动教育状况评价指标”．为了解某校学生一周劳动次数的情况，在该校七、八年级中各随机抽取20名学生进行调查，并将结果整理描述和分析，下面给出了部分信息．七年级20名学生的一周劳动次数为：22233333333445556677八年级20名学生的一周劳动次数条形统计图如图．七、八年级抽取的学生的一周劳动次数的平均数、众数，中位数、5次及以上人数所占百分比如表所示：年级平均数众数中位数5次及以上人数所占百分比七年级 3.95a335%八年级 3.953b c 根据以上信息，解答下列问题：（1）直接写出上述表中的a，b，c的值；（2）若规定：每名学生的劳动次数的绝对差＝|劳动次数﹣平均数|，则七年级这20名学生的劳动次数的绝对差的总和八年级这20名学生的劳动次数的绝对差的总和（填“＞”、“＝”或“＜”）；（3）若一周劳动次数3次及以上为合格，该校七年级有600名学生，八年级有800名学生，估计该校七年级和八年级一周劳动次数合格的学生总人数是多少．21．已知A、B两地之间有一条公路．甲车从A地出发匀速开往B地，甲车出发两小时后，乙车从B地出发匀速开往A地，两车同时到达各自的目的地．两车行驶的路程之和y（千米）与甲车行驶的时间x（小时）之间的函数关系如图所示．（1）甲车的速度为千米/时，a的值为．（2）求乙车出发后，y与x之间的函数关系式．（3）当甲、乙两车相距120千米时，求甲车行驶的时间．22．教材呈现：如图是华师版八年级上册数学教材第96页的部分内容．（1）感知：根据教材内容，如图1，在△ABC中，AD平分∠BAC交BC于D，DE⊥AB 于E，DF⊥AC于F．易证DE＝DF，AE＝AF．（不必证明）（2）探究；如图2，在（1）的情况下，如果∠MDN＝∠EDF，∠MDN的两边分别与AB、AC相交于M、N两点，其它条件不变，请探究AM、AN、AF三条线段的等量关系，并加以证明．（3）拓展应用：如图3，在Rt△ABC中，∠C＝90°，∠BAC＝60°，AC＝6，AD平分∠BAC交BC于D，∠MDN＝120°，ND∥AB，直接写出四边形AMDN的周长＝．23．如图，在Rt△ABC中，∠C＝90°，AB＝5，AC＝4，点D是AB边的中点，点E从点A出发，以每秒5个单位长度的速度向终点B运动，过点E作EF⊥AC于点F，以ED，EF为邻边作▱DEFG，点E运动的时间为t秒．（1）用含有t的式子表示线段DE的长．（2）当点F落在DG的垂直平分线上时，求t的值．（3）作点E关于直线DG的对称点E′，当点E′到△ABC的某两条边的距离相等时，求EF的长．（4）在点E出发的同时，点P从点C出发以每秒2个单位长度的速度向点A运动，当点E停止运动时，点P随之停止运动，过点P作PH⊥AB于点H，直接写出线段PH经过▱DEFG一边中点时t的值．24．在平面直角坐标系中，已知抛物线y＝ax2﹣2ax﹣3a（a是常数，且a＞0）．（1）该抛物线的对称轴是，恒过点．（2）当﹣2≤x≤2时，函数的取值范围是﹣4≤y≤b，求a、b的值．（3）当一个点的横纵坐标都为整数时，称这个点为整点，若该函数图象与x轴围成的区域内有6个整点（不含边界）时，求a的取值范围．（4）当a＝1时，将该抛物线在0≤x≤4之间的部分记为图象G．将图象G在直线y＝t （t为常数）下方的部分沿直线y＝t翻折，其余部分保持不变，得到新图象Q，设Q的最高点、最低点的纵坐标分别为y1、y2，若y1﹣y2≤6，直接写出t的取值范围．参考答案一、选择题（本大题共8小题，每小题3分。

2020-2021学年北京市第三中学高三英语第四次联考试题及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项AThree Things to Do Before You Are 18Are you bored with your daily life? Here are some things you should try before you are 18.★Learn to swimSeriously, this is so important that it can save your life. If you can’t swim well, you won’t be able to dowater sports like waterskiing, surfing and diving. Even taking a boat trip will be dangerous for you. Make sure you do it.★Try at least one kind of team sportsBeing a good team player is an important skill in life. You can’t just think of yourself, but have to work well with other people. Other advantages of team sports like basketball, football and baseball are that they keep you fit and healthy, and they are also great fun. Teams usually have a good social life too—you’ll go to lots of parties and make many friends.★Collect somethingOne of the best hobbies for under-18s is collecting things. You could collect kinds of stamps, or you could collect things that make you remember what you have done, like cinema tickets for films you have seen or letters from friends. The best way to collect is to have a special album to put your collection in and to write what each thing means to you. That way you won’t forget.1. The most important reason for learning to swim is that ________.A. you might feel wellB. it can make you healthyC. you might easily do lots of thingsD. it can save your life2. The writer tells us that one of the best hobbies is to ________ .A. collect somethingB. do some water sportsC. send letters to your friendsD. play basketball with your friends23. The passage is mainly about ________before you are 18.A. good habits to keepB. skills to haveC. things to doD. sports to playBOne day when I was 5, my mother criticized me for not finishing my rice and I got angry. I wanted to play outside and not to be made to finish eating my old rice. In my angry motion to open the screen door (纱门) with my foot, I kicked back about a 12-inch part of the lower left hand corner of the new screen door. But I had no regret, for I was happy to be playing in the backyard with my toys.Today, I know if my child had done what I did, I would have criticized my child, and told him about how expensive this new screen door was, and I would have delivered a spanking (打屁股) for it. But my parents never said a word. They left the corner of the screen door pushed out, creating an opening, a crack in the defense against unwanted insects.For years, every time I saw that corner of the screen, it would remind me of my mistake from time to time. For years, I knew that everyone in my family would see that hole and remember who did it. For years, every time I saw a fly buzzing in the kitchen, I would wonder if it came in through the hole that I had created with my angry foot. I would wonder if my family members were thinking the same thing, silently blaming me every time a flying insectentered our home, making life more terrible for us all. My parents taught me a valuable lesson, one that a spanking or stern (严厉的) words perhaps could not deliver. Their silent punishment for what I had done delivered a hundred stern messages to me. Aboveall, it has helped me become a more patient person and not burst out so easily.4. When the author damaged the door, his parents _______.A. scolded him for what he had doneB. left the door unrepairedC. told him how expensive it wasD. gave him a spanking5. How did the author feel every time he saw the damaged door?A. He felt ashamed of his uncontrolled anger at that time.B. He found that his family members no longer liked him.C. He found it destroyed the happy atmosphere at his home.D. He felt he had to work hard to make up for (弥补) the damage.6. The experience may cause the author _______.A. to hide his anger away from othersB. not to go against his parents’ willC. to have a better control of himselfD. not to make mistakes in the future7. What of the following is the main idea of this passage?A. Adults should ignore their children’s bad behavior.B. Parents shouldn’t educate their children.C. What is the best way to become a more patient person?D. Silent punishment may have a better effect on educating people.CThe China International Search and Rescue Team(CISAR) was formed in 2001 and is now made up of several hundred rescue workers and about 20 police dogs. The team brings help and hope to those whose lives are changed by astorm, flood, earthquake, or any other natural disasters.After long and careful training, the team went on its first international rescue tasks in 2003. That year, the Chinese team helped save lives after earthquakes inAlgeriaandIran. It was the first time that a Chinese team had worked outsideChinawhose members won high praise for bravery and skill.Since then, the CISAR has completed many tasks. The list of people to whom help has been given is long. The team treated more than 3,000 people who were wounded in the 2006 earthquake inIndonesia, helped 2,500 wounded people after the earthquake that hitHaitiin 2010, and spent several months giving aid to over 25,000 people suffering from the 2010 floods inPakistan. On April 26, 2015, a group of 62 people from CISAR went toNepalafter the 8.1 magnitude earthquake that happened there.Rescue workers are trained to find people, treat wounds, and hand out food, water, and other supplies. They have to be able to do work that is difficult under conditions which can be very dangerous. After a disaster, there is usually no electricity or water, and there may be diseases and other dangers. Rescue workers get to save lives, but they must also bury the dead. That means they have to be strong in both body and mind.Rescue workers must have big hearts, too. It takes a lot of love and courage to risk one’s own life to save someone else’s. The members of the CISAR have plenty of both and are always ready to go wherever help is needed.8. What is the function of the numbers in Paragraph 3?A. To advertise for the CISAR.B. To add some basic information.C. To praise Recue Workers’ contributions.D. To stress the dangers Rescue Workers face.9. What is the author’s attitude towards Rescue Workers?A. Hopeful.B. Respectful.C. Curious.D. Supportive.10. What are the last two paragraphs mainly about?A. The duty rescue workers must perform.B. The qualities rescue workers must own.C. The difficulties rescue workers must go through.D. The willingness rescue workers should require.11. What may be the best title of the passage?A. China to the RescueB. How to train CISARC. Welcome to CISARD. Rescue on requestDOne day about eight years ago in the departure lounge (休息室) of a flight from New York's LaGuardia airport to O'Hare in Chicago, I found a young boy in tears and his mother at his side also appeared upset, I walked to them and invited them to our VIP lounge.As it turned out, the boy, Miles and his mom were returning to their home in Kansas City. Miles has had some health problems. Though he had received more than thirty operations in a Jewish Hospital in New York, he would be back for more.Miles enjoyed spending his time in our VIP lounge looking at the entire wall filled with the pictures of many celebrities (名人) who often came to our office. We soon added Miles' picture to the wall among those celebrities.Among the celebrities, Miles like the country singer Garth Brooks best. Miles would just sit and stare at Garth's picture,Oneday, Mr. Brooks was waiting in the lounge for his flight. As he looked at the collection of photographs, Garth asked about the youngster with the big smile. We told him about Miles. We also told him how much Miles loved and respected (尊重) him. He nodded and left.About six months later, Garth was going to be performing in Kansas City and he asked our workers to help him get in touch with the family. He wanted Miles to be his guest. That evening, not only did Miles sit in the front row, but he and Garth also had a private meeting after the performance.Although Miles would receive many more treatments after that special evening, his smile greeted us with every following visit. The face of a sick boy was changed by the joy of a stranger.12. What does the author probably do?A. A worker at an airport.B. A killed photographer.C. A country music singer.D. A doctor in a Jewish hospital.13. What did Miles enjoy doing in the VIP lounge?A. Interviewing celebrities he saw there.B. Seeing pictures of celebrities on the wall.C. Drawing pictures of the celebrities there.D. Singing together with his favorite singer.14. Which words can best describe Garth Brooks?A. Determined and generous.B. Proud and selfish.C. Kind and helpful.D. Powerful and rich.15. What can be the best title for the text?A. Importance of Good ServiceB. Kindness from StrangersC. A Serious Health ProblemD. A Helpless Mother第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

吉吉吉2020-2021吉吉吉吉吉吉吉吉吉吉吉吉吉吉吉吉吉-吉吉吉吉吉吉吉吉林省扶余市第二实验学校2020-2021学年高二下学期第一次月考英语试卷第一节应用文写作（满分15分）假定你是李华，在美国某高中做交换生，对你所租借的小区物业管理有些不满，请你用英语给物业经理写一封意见信，内容包括：1.车辆停放较乱；2.垃圾没有及时清理；3.你的建议。

注意：1.词数80左右；2.开头和结尾已经给出；3.可以适当增加细节，以使行文连贯。

Dear Sir/Madam,I’m LiHua, a resident of the neighborhood.Yours,Li Hua 【答案】Dear Sir or Madam,I’m a resident of the neighborhood and I’m writing to raise some problems.Firstly, there is limited parking space for so many cars. As a result, some cars park everywhere and even in the way, bringing much inconvenience to us. Secondly, the dustbins are not cleared in time. As temperature goes up, the rubbish not only gives off a terrible smell but also pollutes our environment. Thus, I suggest you makestandard parking space and have the car owners follow the rules. Besides, cleaners should be ordered to work according to the timetable that you make.I hope you can help us have a nice living environment. Thank you for your time.Yours,Li Hua 吉林省长春外国语学校2020-2021学年高二下学期第一次月考英语试题第二节书面表达（满分25分）假如你是班长李华，你们班的外教Mark最近生病住院了，请代表你们班的同学给他写封慰问信，内容包括：1.表示难过；2.感谢他的付出；3.希望给他一些帮助。

湖南省长沙一中2020-2021学年高三第一学期第四次调研考试英语试题第一部分听力(共两节, 满分30分)做题时，先将答案标在试卷上。

录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。

第一节(共5小题; 每小题1.5分, 满分7.5分)听下面5段对话。

每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

例:How much is the shirt?A.19.15B.9.18C.9.15答案是C。

1. When does the conversation take place?A. At the beginning of a term.B. At the end of a term.C. During a vacation.2. Why can't the man drive the woman tomorrow?A. His car is being fixed.B. He has a doctor’s appointment.C.He will be working in a shop. 3. What will the woman do? A. Charge her cell phone. B. Visit her mother. C. Make a call. 4. Who will throw a party for the woman next Sunday? A. The woman herself. B. The man. C. Nancy. 5. What does the woman mean? A. Her mother is a housewife. B. Only 10% of American mothers work. C. Most American mothers work. 第二节(共15小题,每小题1.5分，满分22. 5分) 听下面5段对话或独白。

2020届河南省实验文博学校高三英语第四次联考试卷及答案解析第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项ASahara Marathon 2021-Around the WorldThe Sahara Marathon is organized by the Saharawi Ministry of Youth and Sports and a group of volunteers from different countries. During the last twenty years, thousands of runners from all continents have traveled to the Algerian desert to live the experience provided by this race and to bond with refugee families. In this unique edition of 2021, the experience will be different. The race will be held in a virtual way and the donations collected through the event will go to the most needy families in the Saharawi Camps of Tindouf.Rules of the 2021 Sahara MarathonParticipationAll those people over 16 years of age (16 included) may take part in this virtual competition, as long as they are correctly registered, both in time and in form. The registered runner must download the Official Sahara Marathon APP to take the race.Distance and TravelThe distance options selectable in the APP are: 5k, 10k, 21k and 42k. As it is a virtual test, it is very important to make sure that the chosen route allows good mobile coverage for the correct functioning of the GPS. RegistrationRegistration has a cost of 15 euros, which includes participation in the race and a donation of 5 euros to refugee families. Participants can, if they choose, purchase the official pack of the test (T-shirt, scar, and bib) for the price of 25 euros.AcceptanceRegistration is personal and non-transferable and implies acceptance of these regulations. Runners who are not registered or run without the APP will not be admitted.1. What can we learn about the 2021 Sahara Marathon?A. It is a big family event.B. It provides a virtual tour.C. It raises money for charity.D. It will be held in the desert.2. How much should a runner pay if he wants to register for the race?A. 15 euros.B. 20 euros.C. 25 euros.D. 40 euros.3. What are runners required to do in the race?A. Choose safe routes.B. Wear casual clothes.C. Run with the official app.D. Transfer registration in time.BFrom skateboarding to Fleetwood Mac, TikTok users got creative in a pandemic (流行病) year with new songs, dances and shows in 60 seconds or less.The social mediavideo app on Wednesday shared its list of top 100 videos, creators and trends in America during 2020. “These videos brought joy and inspiration to millions of Americans in the rough year,” said Kudzi Chikumbu, director of creator community at TikTok.The platform has been widely associated with Generation Z (people born after 1996), millennials (people born in the 1980s or 1990s) and influencers who have started careers based on the shared videos.The Weeknd'sBlinding Lightsand Jason Derulo's Savage Loveinspired TikTok dance challenges that made them among the top songs used on the app.For some TikTok creators, the pandemic itself became inspiration to create a connection with other users. Comedian Caitlin Reilly used the app during quarantine (隔离) to make fun of those annoying coworkers for one of the top liked videos. And singer Curtis Roach made an song for the endless days at home with his song Bored in the House.The second most popular video was an Idaho man named Nathan Apodaca who shot to fame after coolly singing Dreams by Fleetwood Mac, while skateboarding on a highway.But the most liked TikTok video was awarded to Bella Poarch with 45 million followers, who created a simple but interesting video with a few seconds of well-timed head nods and eye rolls.While the app might be designed for youth, Chikumbu said that the growth of TikTok this year has pushed it more into mainstream culture. “You're seeing everyone from the teenager to the college students with their parents and then their grandparents all making videos,” said Chikumbu. “And now TikTok trulytranscendsgenerations, particularly in this year when people had a lot of time to dig in and not only watch, but try.”4. What do we know about The Weeknd?A. He created the famous song Dreams.B. He started a career based on shared videos.C. He is probably a popular singer on TikTok.D. He organized the TikTok dance challenges.5. What did Curtis Roach think of his life during quarantine?A. Meaningful.B. Peaceful.C. Content.D. Uninteresting.6. The most popular TikTok video in 2020 was created by ______.A. Caitlin ReillyB. Curtis RoachC. Nathan ApodacaD. Bella Poarch7. What does the underlined word “transcends” in the last paragraph mean?A. Makes use of.B. Goes beyond.C. Calls on.D. Takes charge of.CA single toy catches a child's attention for a limited period of time, but a box of items that allows a child to build their own toys will catch their imagination for years to come. This brilliant idea already exists in real product form, and it's called Toyi.Toyi is described as an eco-friendly creative building kit, and it recently won the well-known IF Design Award. It came from Istanbul, Turkish, where a young female designer named Elif Atmaca first came up with the idea for it when she wanted to help the kids living in disadvantaged areas. These children do not have access to the variety of interesting toys that wealthier children do.Toyi Atmaca's design allows children to transform what are around them into clever toys. It consists of sticks, junction parts, flexible connectors, toy body parts like feet, eyes, hands, and wheels that can be used to turn old water bottles, cups, boxes, towels, etc. into cute, clever, and unique playthings. This toy kit upcycles(升级利用) materials that would otherwise go to waste, turning a recycling bin into a treasure container.“Our initial target was to deliver Toyi kits to only disadvantaged children in Turkish,” Atmaca told the media. But during a research conducted with around300 children, .she realized that the restriction on being creative went beyond any boundary. “I saw that everything was planned and shaped by grown-ups, blocking the kids' imagination in a significant way,” said Atmaca.Atmaca concluded that each kid needed space where he or she could freely create. She explained the entire process should be left to kids’ creativity, reminding teachers and all grown-ups that child-led play was an excellent way for children to develop lifelong skills.Toyi's creators are now considering distributing the kits to as many children as possible around the world through different international NGOs. Atmaca notes that for each Toyi kit sold out, they will also donate one kit toa disadvantaged child through different partnerships around the world.8. Why did Atmaca design Toyi at first?A. To win the famous IF Design Award.B. To help poor kids make their own toys.C. To protect the environment in Istanbul.D. To recycle all the waste in the dustbin.9. Which is probably the product made with the toy kit of Toyi?A. A new picture of a young boy.B. A computer with high technology.C. A treasure container from a dustbin:D. A six-armed “robot” from a water bottle.10. How do the toy kits help improve the children's ability?A. It provides the kids various types of toys.B. It offers space for the kids’ creative minds.C. It changes the poor kids' living conditions.D. It teaches the kids to share joys with others.11. What is the new target for Atmaca and her partners?A. Donating toykits to more poor children.B. Selling toy kits to every kid in the world.C. Designing new toy kits for kids and adults.D. Doing further research on the kids' demands.DThe annual 3-to-4-millimeter rise in sea levels is expected to impact many coastal communities in the coming decades. However, few are as defenceless as the Republic of theMaldives, a collection of more than a thousand picturesque islands in theIndian Ocean. NASA researchers believe that parts of what is “arguably the lowest-lying country in the world” will become uninhabitable by 2050, due to wave-driven flooding and limited freshwater. To fight the unavoidable, the government recently revealed plans for the world's first 'true' floating island city.The aptly-named Maldives Floating City (MFC) is the brainchild of Dutch Docklands, a global leader in floating infrastructure (基建). According to the March 13, 2021, announcement, the new city will be constructed on a 200-hectare lagoon (环礁湖) located just 10 minutes by boat from the Maldivian capital, Male. It will initiallyconsist of a thousand waterfront residences, arranged in a series of honeycomb-like maze rows. The developers plan to add hotels, restaurants, shops, and even a school and a hospital in the near future. The floating structures. will be attached to the surrounding islands, which will form a base and provide protection from high tides.Maldive officials aim to make MFC as self-sufficient as possible. Freshwater storage will provide drinking water for residents, while floating solar blankets and agriculture fields will take care of their energy and food needs.“ThisMaldivesFloatingCitydoes not require any land rehabilitation, therefore has a minimal impact on the coral reefs,” explains Mohamed Nasheed, Speaker of Parliament. “What's more, giant, new reefs will be grown to act as water breakers. In theMaldives,we cannot stop the waves, but we can rise with them.”Construction of the revolutionary city is expected to begin in 2022 and be completed in phases over the next five years. If successful, it will provide a blueprint for other countries facing a similar situation.12. Why doesMaldivesdecide to build MFC?A. It is the lowest-lying country.B. It will be flooded soon.C. It is running out of fresh water.D. It will be unsuitable for living.13. What is Paragraph 2 mainly about?A. The prospect of MFC.B. The developers of the plan.C. The location of the residences.D. The barriers to the construction.14. What can we infer from the underlined words?A. MFC will keep waves away.B. MFC will make use of waves.C. MFC will adjust to the waves.D. MFC will work as water breakers.15. What's the writing purpose of this passage?A. To introduce a construction program.B. To appeal to people to protect nature.C. To seek international help forMaldives.D. To report the achievement of a city plan,第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

东北师大附中2024—2025学年上学期第一次摸底考试高三年级 (英语) 科试卷考试时长：120 分钟满分: 150分第Ⅰ卷选择题(满分95分)第一部分听力(共两节，满分30分)第一节 (共5小题; 每小题1.5分, 满分7.5分)听下面5段对话。

每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你将有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1. What are the speakers doing?A. Studying a book.B. Reading a letter.C. Collecting money.2. What is the woman looking for?A. Her hat.B. Her coat.C. Her gloves.3. What kind of paper are the speakers going to write?A. A historical one.B. A biological one.C. A geographical one.4." What will the weather be like tomorrow morning?A. Windy.B. Rainy.C. Sunny.5. Why does Fred decide to quit?A. He often works overtime.B. He needs to earn more money.C. He doesn't get on well with his colleagues.第二节 (共15小题; 每小题1.5分, 满分22.5分)听下面5段对话或独白。

每段对话或独白后有几个小题，从题中所给的A、B、C三个选项选出最佳选项，并标在试卷的相应位置。

听每段对话或独白前，你将有时何阅读各个小题，每题5秒钟：听完后，各小题将给出5秒钟的作答时间。

2020-2021学年度第一学期阶段性教学质量检测四年级英语试卷I.根据汉语意思补全单词。

(每小题1分，共10分)1. 1__s__en (听)2.s__eter(毛衣)3.s_ck(短袜)4. cl__a_(打扫)5.h_mew_ rk(家庭作业)6.w___ k(星期)7. w___sh(洗) 8.d_ess(连衣裙) 9.pl__ y(玩)10.w_ t_ h(看)Ⅱ.选出画线部分发音不同的单词。

(每小题2分，共10分)( ) 1. A. Sunday B. bus C. Tuesday( ) 2. A. shoes B. hot C. orange( ) 3. A. bed B. red C. eleven( ) 4. A. face B. cap C. black( ) 5. A. kite B. pig C. riverⅢ.选出每组中不同类的词。

(每小题2分，共10分)( ) 1. A. read B. book C. draw D. write( ) 2. A. toys B. ball C. kite D. wash( ) 3. A. brush B. hand C. face D. hair( ) 4. A. gloves B. cap C. bed D. scarf( ) 5. A. shirt B. shorts C. coat D. bearⅣ.选择正确的选项。

(每小题2分，共24分)( ) 1. These are_____.A. dressB. socksC. coatD. cap( ) 2. This is an_____.A. old shoesB. old coatC. new sweaterD. new coat( ) 3. I_____TV after dinner.A. lookB. readC. seeD. watch( ) 4. What do you do____ Saturday?A. of B .in C. on D. for( ) 5. Is this cap?A. KimB. Danny’sC. JennyD. you( ) 6. I put on my____A. coatB. bedC. bookD. hand( ) 7. Are____ her shoes?A. thisB. itC. theseD. them( ) 8. She is_____ a white skirt.A. wearB. wearingC. wearsD. putting( ) 9. In the evening, I ____a book.A. seeB. readC. lookD. watch( ) 10.We play catch_____ a ball.A. withB. andC. orD. of( ) 11.In the morning, John_____ his teeth and his face.A. brush, washB. washes, brushesC. wash, brushD. brushes, washes( ) 12. I talk_____ the phone_____ my friends.A. on, andB. in, withC. on, withD. of, withV.选择正确的选项补全对话。

2020 — 2021学年高三上学期12月月考英语试卷（全国卷）（满分150分，考试时间120分钟）注意事项：1. 答卷前，考生务必将自己的姓名、考生号等填写在答题卡上。

2. 回答选择题时，选出每小题答案后，用铅笔把答题卡上对应题目的答案标号涂黑。

如需改动，用橡皮擦干净后，再选涂其他答案标号。

回答非选择题时，将答案写在答题卡上，写在本试卷上无效。

3. 考试结束后，将本试卷和答题卡一并交回。

第一部分听力（共两节，满分30分）做题时，先将答案标在试卷上。

录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。

第一节（共5小题；每题1.5分，满分7.5分）听下面5段对话。

每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1. What are the speakers mainly talking about?A. Customs in China.B. Driving in Rome.C. Traffic rules in England.2. How does the man feel about his job?A. Boring.B. Relaxing.C. Enjoyable.3. Which club will the man probably join?A. The Tennis Club.B. The Drama Club.C. The Swimming Club.4. What should the boy do in the woman’s opinion?A. Revise for the exams right away.B. Rewrite his English paper.C. Wait for the exam result.5. What is the man’s hobby?A. Playing football.B. Listening to music.C. Reading.第二节（共15小题；每题1.5分，满分22.5分）听下面5段对话或独白。