《大学英语（一）》模拟试题二
第一部分：交际用语（共5小题；每小题1分，满分5分）
此部分共有5个未完成的对话，针对每个对话中未完成的部分有4个选项，请从A、B、C、D四个选项中选出可以填入空白处的最佳选项，并用铅笔将答案题卡上的相应字母涂黑。示例[A] [B] [C] [D]
1. — Do you think city life can benefit people a lot?
— _______
A. Well, that depends.
B. Of course, it is.
C. Yes, perfectly.
D. Nothing at all.
2. — If you were in my situation, what would you do?
— _______
A. I'm sorry to know that.
B. Sorry, I have no idea.
C. It's no big deal.
D. Why worry?
3. — _______
— Why not stay for another cup of tea?
A. I'm afraid I'd better say goodbye.
B. See you.
C. It's good to talk with you.
D. I'm sorry I have no more time.
4. — I think it would be a good idea to play table tennis after class.
— _______
A. It's my favorite.
B. It doesn't count.
C. I am with you.
D. Yes, let's go.
5. — Monica, I'd like you to meet Philip. He is the monitor of our class.
— _______
A. It is so good.
B. Oh, I am happy.
C. Nice to meet you.
D. Good!
第二部分：阅读理解（共20小题；每小题2分，满分40分）
此部分共有4篇短文，每篇短文后有5个问题。请从每个问题后的A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并用铅笔将答题卡上的相应字母涂黑。示例[A] [B] [C] [D]
Passage 1
Are you nervous? Maybe you should sit in a blue room. Are you always cold? Maybe you should sit in a room painted in a warm color such as soft orange. Are you often sad? Maybe you should sit in a yellow room. Some researchers believe that color has the power to affect our feelings. They believe that colors affect almost everyone in the same way. They tested the idea in different settings.
One study was done in a workplace. The researchers painted heavy boxes white and light boxes black. They wanted to see how color affected the workers' feelings. Which boxes do you think were more difficult to lift? The heavy white ones? No. The black boxes were more difficult.
The white boxes were heavier but they looked light. The researchers think that this is because light colors seem light.
Another study was done at a hospital with brown and dark green walls. Painters repainted the hospital walls in bright colors — bright orange on the first floor, bright pink on the second, bright green on the third. Guess what happened? The patients changed. They visited each other and talked more. The workers also changed and were happier about their work.
Another study was done at a school. Researchers at the University of Alberta in Edmonton, Canada, studied children with behavior problems in their classroom. When the walls were brown and yellow, the children's heart rates went up and they were overactive. When the walls were light and dark blue, the children's heart rates were slower and the children were much calmer.
If this is true, people might start to think carefully about the colors around them—not just in houses, but also in offices, in schools, in hospitals, in gyms, in prisons, in museums, and in restaurants!
6. What is the main idea of this article?
A. Children are calmer in light blue rooms.
B. If you are sad, sit in a yellow room.
C. A heavy box seems light if it has a light color.
D. Colors affect people's feelings.
7. Which of the following places is NOT mentioned in the examples to show how colors affect people's feelings?
A. Hospital.
B. Workplace.
C. Restaurant.
D. School.
8. Colors such as red, yellow, and soft orange make people feel _______.
A. cold
B. warm
C. sad
D. tired
9. Blue makes people feel _______.
A. warm
B. calm
C. nervous
D. active
10. A dark colored box looks _______ than a light colored box.
A. lighter
B. heavier
C. softer
D. bigger
Passage 2
Mr. Brown was going away for a week. Before he left, he said to his son, “if anyone asks for me, you can tell him that your father has been out for doing something, and will be back in a week, then be sure to ask him to sit down for a cup of tea.”
“OK, Dad,” said his son. But he was afraid his son couldn’t remember this, he wrote these words down on a piece of paper and gave it to him. His son put it into his small pocket, took it out and looked at it every now and then.
Four days passed, but no one came to see his father. The boy thought that there was no man to come and that the piece of paper was of no more use for him, so he burnt it that evening.
The next afternoon, someone knocked at the door. The boy opened it. A man was standing at the door and said, “Where is your father?” The boy put his hand into his pocket at once and looked for the piece of paper. He could not find it. He suddenly remembered he had burnt it, so he shouted, “No more.”
The man was v ery surprised. He asked, “No more? I met your father last week. When did it happen?”
“Burnt yesterday evening.”
11. Mr. Brown told his son that _______.
A. he would be away from home for four days
B. he would be back in seven days
C. he would be back in a month
D. he liked a cup of tea
12. Mr. Brown wrote the words down on _______.
A. the wall
B. the door
C. a piece of paper
D. his son’s pocket
13. A man came to visit the boy’s father on _______.
A. the second day
B. the third day
C. the fourth day
D. the fifth day
14. The man was very surprised because _______.
A. he thought the child’s father was dead
B. the child didn't ask him to sit down
C. the child gave him a cup of tea
D. he couldn't find that piece of paper
15. What was burnt?
A. The piece of paper.
B. Mr. Smith
C. The visitor.
D. The boy.
Passage 3
During the rule of a king there lived a famous magician. One day this magician foretold（预言）the death of a man who was a favorite of the king. It happened that the man died on the very day foretold. The king was very angry when he heard that his friend had died. He said that it was the magician’s fault, and he sent for him.
When the magician came in, the king said, “You were able to foretell the death of my friend. Can you foretell the date of your own death?”
When the poor man heard this, he was very frightened. He thought that the king meant to have him killed. For a few moments he did not answer. He was wondering what he could say for himself.
“Your Majesty,” he said bowing, “I cannot foretell the exact date of my death, but I can foretell that I shall di e one day before your Majesty.”
Hearing this, the king became greatly frightened and his face turned pale.
16. The king was very angry because _______.
A. his friend really died on the day foretold.
B. the magician foretold his friend’s death.
C. the magician couldn’t foretell anyone’s death
D. the magician looked down upon the king by not foretelling his death.
17. The magician foretold that the king would die _______.
A. on the same day as he was killed
B. one day after his death
C. one day before his death
D. on any day he foretold
18. “Can you foretell the date of your own death?” the king meant _______.
A. to know how good a magician he was
B. to play a joke on the magician
C. to know if the magician would die soon
D. to kill the famous magician
19. After the magician foretold the death of himself, _______.
A. the king felt hurt and had the magician killed at once
B. the king didn’t believe the foretelling at all
C. the magician was given a good beating as a punishment
D. the king wanted to do everything to make the magician live as long as possible
20. In this passage, the underlined word “favorite” (line 2) means _______.
A. that you like better
B. which you like best
C. the person that you like more than others
D. the thing that you love more than other
Passage 4
For several years, Americans have enjoyed tele-shopping — watching TV and buying things by phone.
Now tele-shopping is becoming popular in Europe. In a number of European countries, people can turn on their TVs and shop for clothes, jewelry, food, toys and many other things.
Tele-shopping is becoming popular in Sweden, for example, the biggest Swedish company sells different kinds of things on TV in 15 European countries, and in one year it made $100 million. In France there are two tele-shopping channels, and the French spend about $20 million a year buying things through those channels.
In Germany, until last year tele-shopping was only possible on one channel for an hour every day. The government allowed more tele-shopping. Other channels can open tele-business, including the largest American tele-shopping company and a 24-hour tele-shopping will help them sell more things.
21. Tele-shopping means _______.
A. to buy telephones
B. to watch TV
C. to buy TV sets
D. to buy things through telephone
22. Tele-shopping is becoming popular in _______.
A. Sweden
B. Germany
C. France
D. Europe
23. _______ spend $20 million buying things through tele-shopping.
A. Americans
B. Frenchmen
C. Swedish
D. Germans
24. _______ was the last to begin tele-shopping among these countries mentioned in the passage.
A. France
B. Sweden
C. Germany
D. America
25. The largest American company opens for tele-shopping _______.
A.12 hours every day
B. one hour every day
C. eight hours every day
D. day and night
第三部分：词汇与结构（共15小题；每小题1分，满分15分）
此部分共有15个未完成的句子，针对每个句子中未完成的部分有4个选项，请从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并用铅笔将答题卡上的相应字母涂黑。示例[A] [B] [C] [D]
26. The dress I bought in the market is inferior in quality _______ that similar one sold in the
store.
A. as
B. to
C. than
D. with
27. A fixed _______ at others is an impolite behavior, which everyone is to be taught in their
childhood.
A. glimpse
B. sight
C. watch
D. stare
28. Watching the TV program on children, I _______ a good idea to solute the problem.
A. came out
B. came for
C. came up with
D. came to
29. _______ baby deer can stand as soon as it is born.
A. A
B. An
C. The
D. /
30. You are _______ student in the school.
A. the diligent
B. more diligent
C. diligenter
D. the most diligent
31. There is a principle for successful communication that friendly smiles will always work
_______ you.
A. at
B. out
C. for
D. against
32. Taking a (an) _______ attitude towards life is to make a good life.
A. positive
B. negative
C. expressive
D. aggressive
33. Did the Smiths buy _______ when they moved into the new house?
A. many new furnitures
B. much new furnitures
C. many new furniture
D. much new furniture
34. Is this dictionary _______ o r _______? It’s mine.
A. your, hers
B. yours, her
C. your, her
D. yours, hers
35. It’s usually quite here _______ Sunday morning.
A. on
B. in
C. at
D. by
36. The government has acted out a law to reduce the number of _______ into this country every
year.
A. immigrates
B. emigrates
C. immigrants
D. emigrants
37. Bill and Mike are twins, but the former is tall and strong while the _______ is short and thin.
A. late
B. later
C. last
D. latter
38. To be exact, _______ people were injured in the earthquake.
A. thousands of
B. six thousands
C. six thousand
D. six thousands of
39. Don’t hurry! You still have _______ time.
A. little
B. a little
C. few
D. a few
40. _______ room is big and bright. They like it very much.
A. Tom and Sam
B. Tom’s and Sam
C. Tom and Sam’s
D. Tom’s and Sam’s
第四部分：完形填空（共10小题；每小题1分，满分10分）
以下短文中共包含10个未完成的句子，针对每给句子中空缺部分有4个选项，请从A、B、C、D 四个选项中，选出可以填入空白处的最佳选项，并用铅笔将答题卡上的相应字母涂黑。示例[A] [B] [C] [D]
After supper Mrs. Bell felt hot and came out of the hotel. She got to 41 a week before. She liked the city and went traveling there for 42 first time. Now she was walking along a quite street when she saw a man working in a garden. She 43 to watch him carefully. The old man worked 44 and she was sure he was an able gardener. She liked to see him.
“I have a garden, too,” the woman said to herself, “I 45 such a gardener. Why won’t I bring one to America?”
So she went into the garden and said she would pay him much if he 46 to go to America with her.
“I’ll pay for your fare（费用）, too,” said the woman. “You’ll be able to get 47 soon in my country, I think.”
“Thanks a lot,” said the old man, “but it’s grateful that I have 48 position. I can’t abdicate （放弃）for it. I’ll have to work for you 49 they don’t elect（选举)）me next time.”“Oh?” the woman said in surprise, “ 50 are you, then?”
“The President of France.”
41. A. Toronto B Paris C. Moscow D. Sydney
42. A. a B. an C. the D. /
43. A. ends B. hurried C. stopped D. went on
44. A. slowly B. sadly C. badly D. hard
45. A. need B. hope C. hate D. wish
46. A. disliked B. frightened C. believed D. agreed
47. A. lonely B. happy C. rich D. poor
48. A. other B. others C. the other D. another
49. A. until B. unless C. because D. if
50. A. Who B. How C. What D. Whose
第五部分：英汉互译（满分15分；共5小题，每小题3分）
请按要求把下列5个句子翻译成中文或英文，把答案写在答题纸上。
51. During the whole summer holiday the boy was glued to the TV set watching animations（动画
片）almost all day long. （英译汉）
52. Not only do Americans import sports, but they export sports fever, as well. （英译汉）
53. Write down any new word you discover and look it up in your dictionary. （英译汉）
54. 去年冬天一场暴风雪席卷了这一地区。(sweep across) （汉译英）
55. 去国外读书的机会的确很吸引青年学生。(appeal to)（汉译英）
第六部分：句子写作（满分15分；共5小题，每小题3分）
请按照括号里面的要求造句、改写句子或者改错，把答案写在答题纸上。
56. a valuable experience, us, studying abroad, is, for（用“主—系—表”句型造句）
57. Having no money and being lonely in the big city. The woman committed suicide.（改错，此
句为残缺句）
58. My aunt prepared the soup. I drank the soup. （用定语从句引导词that/which将以上两个句
子组合成为一个句子）
59. His speech encouraged everyone who was present.（改错，使句子简洁）
60. Jack can’t play table tennis. Mary can’t play table tennis, either.（用并列连词neither…nor…
将以上两个句子连接成为一个句子）
大学英语四级模拟题四 Part One Reading Comprehension (2’×10 = 20’) Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the centre. Passage One Air pollution can spread from city to city. It even spreads from one country to another. Some northern European countries have had “black snow”from pollutants that have traveled through the air from other countries and have fallen with the snow. So air pollution is really a global problem. Air pollution can kill babies, older people, and those who have respiratory（呼吸的）diseases. As found in cities, air pollution increases the risks of certain lung diseases. Air pollution can cause both airplane and car accidents because it cuts down visibility （能见度）. There are other possible health dangers from air pollution that we don’t know much about. For example, scientists are trying to find out whether chemicals that reach us from the air may cause changes in our cells. These changes might cause babies to be born with serious birth defects. Scientists are trying to learn how all the many chemicals are apt（易于的）to take into our bodies from air, water, food, and even medicines act together to affect our health and the way our bodies work. That is another reason why it is so important to begin to control pollution now instead of waiting until we learn all the answers. Air pollution costs us a lot of money. It corrodes（腐蚀）our buildings. It damages farm crops and forests. It has a destructive effect on our works of art. The cost of all this damage to our government is great. It would be much more worthwhile, both for us and for the government, to spend our tax dollars on air pollution control. 1. Air pollution may lead to airplane accidents because . A. it may cause pilots to be ill B. engines may fail from the air-borne dirt C. visibility is reduced D. it brings a lot of black snow 2. Scientists are trying to find a link between pollution and . A. intelligence levels B. birth problems C. man’s behavior D. the nervous system 3. Scientists have not yet determined . A. all of the effects of pollution on the human body B. how pollution can be controlled successfully C. when the atmosphere first became polluted D. how some snow becomes black 4. The author suggests that before air pollution becomes more serious, . A. factories will be forced to stop operating B. buildings should be protected C. the earth will begin to grow colder D. more money should be spent to solve the problem 5. We can conclude that . A. civilization may be ruined if pollution is not controlled B. pollution is more serious in Europe than it is in America C. most people do not know that pollution is a serious problem D. we should learn all the answers before we begin to control pollution Passage Two Stiletto heels could be banned from the workplace because of health and safety reasons, according to British Trade Union bosses. The Trade Union Congress, predominantly male, has proposed a motion arguing that high heels are disrespectful to women while they also contribute to long term injuries. They propose instead that women wear “sensible shoes”with an inch heel limit in an attempt to avoid future foot and back pain as well as injuries. The motion is due to be debated at next month’s conference. The motion states: “Congress believes high heels may look glamorous on the Hollywood catwalks but are completely in appropriate for the day-to-day working environment. Feet bear the burden of daily life, and for many workers prolonged standing, badly fitted footwear, and in particular high heels can be a hazard. Around two million days a year are lost through sickness as a result of lower limb disorders. Wearing high heels can cause long-term foot problems and also serious foot, knee and back pain and damaged joints. Many employers in the retail sector force women workers to wear high heels as part of their dress code. More must be done to raise awareness of this problem so that women workers and their feet are protected.” Nadline Dorries, the Tory Member of Parliament, however criticized the motion and said the extra height heels give women can help them when in the workplace. “I’m 5ft 3in and need every inch of my Christian Louboutin heels to look my male colleagues in the eye,”she said. “If high heels were banned in Westminster, no one would be able to find me. The Trade Union leaders need to get real, stop using obvious sexist tactics by discussing women’s
2001年1月大学英语四级(CET-4)真题试卷 Part I Listening Comprehension (20 minutes) Section A Directions: In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A), B), C) and D), and decide which is the best answer. Then mark the corresponding letter on the Answer Sheet with a single line through the center. Example: You will hear: You will read: A) 2 hours. B) 3 hours. C) 4 hours. D) 5 hours. From the conversation we know that the two were talking about some work they will start at 9 o’clock in the morning and have to finish
2010上半年大学英语(3)第2次作业大学英语（三） 第一部分：交际英语（每题3分，共15分） 1. — _____A_______________ — Well, they got there last Wednesday. So about a week. A. How long have your parents been in Paris? B. When did your parents arrive at Paris? C. Did your parents arrive at Paris last Wednesday? D. When will your parents go to Paris? 2. —My mother is pretty sick. —____C______________. A. Good for her. B. Oh, it’s not true. C. That’s too bad. D. Why s 3. — I'd like to say goodbye to everyone. My plane leaves at 7:25. — Well, ______C________________. A. sounds great B. good for you C. goodbye and have a good trip D. it’s emergent 4. — Good morning, sir. Can I help you? — _______B__________. A. Yes, why not? B. Yes, is there a bank near here? C. Are you kidding? D. You are welcome! 5. — Please help yourself to some seafood. — ______D_________. A. No, I can’t. B. Sorry, I can’t help. C. Well, seafood don’t suit. D. Thanks, but I don’t like seafood. 第二部分：阅读理解（每题3分，共30分） Passage 1 A new study suggests that the more teenagers watch television, the more likely they are to develop depression as young adults. But the extent to which TV may or may not be to blame is a question that the study leaves unanswered. The researchers used a national long-term survey of adolescent health to investigate the relationship between media use and depression. They based
洛基英语，中国在线英语教育领导品牌 Model Test 1 Part One Listening Comprehension Section A Directions： In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said - Both the conversation and the question will be spoken only once. After each question there will be pause. During the pause, you must read the four choices marked A）, B）, C）and D）, and decide which is the best answer. Then mark the corresponding letter on the Answer Sheet with a line through the centre. Example： You will hear： You will read： A） At the office. B） In the waiting room. C） At the airport. D） In a restaurant. From the conversation we know that the two were talking about some work they had to finish in the evening. This is most likely to have taken place at the office. Therefore, A） At the office is the best answer. You should choose [A] on the Answer Sheet and mark it with a single line through the centre. 1. A） She is not interested in the article. B） She has given the man much trouble. C） She would like to have a copy of the article. D） She doesn't want to take the trouble to read the article. 2. A） He saw the big tower he visited on TV~ B） He has visited the TV tower twice. C） He has visited the TV tower once. D） He will visit the TV tower in June. 3. A） The woman has trouble getting along with the professor. B） The woman regrets having taken up much of the professor's time. C） The woman knows the professor has been busy. D） The woman knows the professor has run into trouble. 4. A） He doesn't enjoy business trips as much as he used to. B） He doesn't think he is capable of doing the job. C） He thinks the pay is too low to support his family, D） He wants to spend more time with his family. 5. A） The man thought the essay was easy. B） They both had a hard time writing the essay. C） The woman thought the essay was easy. D） Neither of them has finished the assignment yet. 6. A） In the park. B） Between two buildings C） In his apartment. D） Under a huge tree. 7. A） It's awfully dull. B） It's really exciting.
大学物理上作业2 单项选择题 第1题保守力作功与过程无关，与参考系的选取无关，以上说法： A、正确 B、错误 C、不确定 D、无意义 答案：A 第2题若质点所受的合力矩为零，则质点的角动量不随时间改变。是___ A、质点的角动量守恒定律 B、动量守恒定律 C、质点系的动量定理 D、质点的机械能守恒定律 答案：A 第3题有关质点系的规律都可用于刚体，以上说法： A、正确 B、错误 C、不确定 D、无意义 答案：A 第4题任何时刻绕定轴转动的刚体不只有一个角速度，以上说法： A、正确 B、错误 C、不确定 D、无意义 答案：B 第5题在下列四个实例中，你认为哪一个实例中物体和地球构成的系统的机械能不守恒
A、物体作圆锥摆运动 B、抛出的铁饼作斜抛运动(不计空气阻力) C、物体在拉力作用下沿光滑斜面匀速上升 D、物体在光滑斜面上自由滑下 答案：C 判断题 第6题功是力作用对空间的积累，不受空间性质的影响 答案：错误 第7题摩擦力作功与路径有关 答案：正确 第8题动量与参考系选择无关, 但冲量、动量的增量与惯性系的选取有关。 答案：错误 第9题在任意时刻,平动刚体上各点的速度、加速度都相同。 答案：正确 第10题力矩的功就是力所作的功的一部分。 答案：错误
填空题 第11题若质点在某空间内任一位置都受到保守力作用,该空间存在___。 答案：保守力场 第12题冲量的定义是___。 答案：力与力作用时间的乘积 第13题刚体内各点都绕同一直线作圆周运动。则这种运动叫___。 答案：定轴转动 第14题决定转动惯量J大小的三个因素___,___,___。 答案：转轴位置、刚体质量、质量对轴的分布 第15题绕定轴转动刚体的动能定理是___。 答案：绕定轴转动刚体动能的微分，等于作用在刚体上所有外力之功的代数和 问答题 第16题平行轴定理。 答案：刚体对任意已知轴的转动惯量，等于刚体对通过质心并与该已知轴平行的轴的转动惯量加上刚体的质量与两轴间垂直距离d平方的乘积。 第17题保守力的特点？ 答案：（1）保守力沿闭合路径一周所做的功为零,（2）保守力作功与过程无关,与参考系的选取无关。第18题质点系机械能守恒定律。 答案：若运动过程中，作用于质点系的所有外力和非保守内力都不作功,或其元功之和恒为零时, 质点系内各质点间动能和势能可以互换,但它们的总和(即机械能)保持不变。 第19题质点系动量沿坐标轴投影的守恒定律。 答案：系统在某个方向上所受的合外力为零,则总动量沿此方向的分量守恒。
2016 年 6 月大学英语四级考试真题（第三套） Part I Writing (30 minutes) For this part, you are allowed 30 minutes to write a letter to express your thanks to your parents or any family members upon making memorable achievement. You should write at least 120 words but no more than 180 words. Directions: 注意：此部分试题请在答题卡 1 上作答。 Part Ⅲ Reading Comprehension (40 minutes) Section A Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the center. You may not use any of the words in the bank more than once.
题号:1 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:2 Not until the 1980's, when the company was taken over by Eisner, ________ an advantage in the hot competition. A、had it gained B、did it gain C、it gained D、gained it 学员答案：a 说明： 本题得分：2 题号:2 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:2 ________extremely fashionable clothes and ________ by reporters, the famous actress picked up the microphone. A、Wear,surrounded B、Wearing,surrounded C、Wearing, surrounding D、Wear, surrounding 学员答案：b 说明： 本题得分：2 题号:3 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:2 The bank manager asked his assistant if it was possible for him to _______ the investment plan in a week. A、work out B、put out C、point out D、set out 学员答案：a 说明： 本题得分：2 题号:4 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:2 The sale usually takes place outside the house, with the audience ________ on benches, chairs or boxes. A、having seated B、seating
大学物理学(第三版)第二章课后答案
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习题2 2.1 选择题 (1) 一质点作匀速率圆周运动时， (A)它的动量不变，对圆心的角动量也不变。 (B)它的动量不变，对圆心的角动量不断改变。 (C)它的动量不断改变，对圆心的角动量不变。 (D)它的动量不断改变，对圆心的角动量也不断改变。 [答案：C] (2) 质点系的内力可以改变 (A)系统的总质量。 (B)系统的总动量。 (C)系统的总动能。 (D)系统的总角动量。 [答案：C] (3) 对功的概念有以下几种说法： ①保守力作正功时，系统内相应的势能增加。 ②质点运动经一闭合路径，保守力对质点作的功为零。 ③作用力与反作用力大小相等、方向相反，所以两者所作功的代数和必为零。 在上述说法中： (A)①、②是正确的。 (B)②、③是正确的。 (C)只有②是正确的。 (D)只有③是正确的。 [答案：C] 2.2填空题 (1) 某质点在力i x F )54( （SI ）的作用下沿x 轴作直线运动。在从x=0移动到x=10m 的过程中，力F 所做功为 。 [答案：290J ] (2) 质量为m 的物体在水平面上作直线运动，当速度为v 时仅在摩擦力作用下开始作匀减速运动，经过距离s 后速度减为零。则物体加速度的大小为 ，物体与水平面间的摩擦系数为 。 [答案：2 2 ;22v v s gs ] (3) 在光滑的水平面内有两个物体A 和B ，已知m A =2m B 。（a ）物体A 以一定的动能E k 与静止的物体B 发生完全弹性碰撞，则碰撞后两物体的总动能为 ；（b ）物体A 以一定的动能E k 与静止的物体B 发生完全非弹性碰撞，则碰撞后两物体的总动能为 。
2004年1月大学英语四级考试试题及参考答案 Part I Listening Comprehension (20 minutes) Section A Directions: In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation Θ?▆ ? ?https://www.doczj.com/doc/8416426223.html,/?版权所有沪江网? ? ▆? Θ and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A), B), C) and D), and decide which is the best answer. Then mark the corresponding letter on the Answer Sheet with a single line through the centre. Example: You will hear: You will read: A) At the office. B) In the waiting room. C) At the airport. D) In a restaurant. From the conversation we know that the two were talking about some work they had to finish in the evening. This conversation is most likely to have taken place at the office. Therefore, A) "At the office" is the best answer. You should choose [A] on the Answer Sheet ??鱕? 砝骔 https://www.doczj.com/doc/8416426223.html,/podcast.htm?版权所有沪江网骔砝 ?鱕??and mark it
班级___ ___学号____ ____姓名____ _____成绩______________ 一、选择题 1. m 与M 水平桌面间都是光滑接触，为维持m 与M 相对静止，则推动M 的水平力F 为：( B ) (A)(m +M )g ctg θ (B)(m +M )g tg θ (C)mg tg θ (D)Mg tg θ 2. 一质量为m 的质点，自半径为R 的光滑半球形碗口由静止下滑，质点在碗内某处的速率为v ，则质点对该处的压力数值为：( B ) (A)R mv 2 (B)R mv 232 (C)R mv 22 (D)R mv 252 3. 如图，作匀速圆周运动的物体，从A 运动到B 的过程中，物体所受合外力的冲量：( C ) (A) 大小为零 (B ) 大小不等于零，方向与v A 相同 (C) 大小不等于零，方向与v B 相同 (D) 大小不等于零，方向与物体在B 点所受合力相同 二、填空题 1. 已知m A =2kg ，m B =1kg ，m A 、m B 与桌面间的摩擦系数μ=0.5，(1)今用水平力F =10N 推m B ，则m A 与m B 的摩擦力f =_______0______，m A 的加速度a A =_____0_______. (2)今用水平力F =20N 推m B ，则m A 与m B 的摩擦力f =____5N____，m A 的加速度a A =_____1.7____. (g =10m/s 2) 2. 设有三个质量完全相同的物体，在某时刻t 它们的速度分别为v 1、v 2、v 3，并且v 1=v 2=v 3 ，v 1与v 2方向相反，v 3与v 1相垂直，设它们的质量全为m ，试问该时刻三物体组成的系统的总动量为_______m v 3________. 3.两质量分别为m 1、m 2的物体用一倔强系数为K 的轻弹簧相连放在光滑水平桌面上(如图)，当两物体相距为x 时，系统由静止释放，已知弹簧的自然长度为x 0，当两物体相距为x 0时，m 1的速度大小为 2 2 121 Km x m m m + . 4. 一弹簧变形量为x 时，其恢复力为F =2ax -3bx 2，现让该弹簧由x =0变形到x =L ，其弹力的功为： 2 3 aL bL - . 5. 如图，质量为m 的小球，拴于不可伸长的轻绳上，在光滑水平桌面上作匀速圆周运动，其半径为R ，角速度为ω，绳的另一端通过光 滑的竖直管用手拉住，如把绳向下拉R /2时角速度ω’为 F m A m B m M F θ A O B R v A v B x m 1 m 2 F m R
2019年1月大学英语四级(CET-4)真题试卷 Part I Listening Comprehension (20 minutes) Section A Directions: In this section, you will hear 10 short conversations. At the end of each conversation, a question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A), B), C) and D), and decide which is the best answer. Then mark the corresponding letter on the Answer Sheet with a single line through the center. Example: You will hear: You will read: A) 2 hours. B) 3 hours. C) 4 hours. D) 5 hours. From the conversation we know that the two were talking about some work they will start at 9 o’clock in the morning and have to finish at 2 in the afternoon. Therefore, D) “5 hours” is the correct answer. You should choose [D] on the Answer Sheet and mark it with a single line through the center. Sample Answer [A] [B] [C] [D] 1. A) Get some change form Jane. B) Use the woman’s phone. C) Go look for a pay phone. D) Pay for the phone call. 2. A) At a bookstore. B) In a workshop. C) At an art gallery. D) In a department store. 3. A) She’s bought the man a pair of glasses today. B) She will help the man to catch up. C) She is worried about the man’s health.
新大学英语（2）第三次网络作业 (三次网络作业的平均成绩占期末考试总评成绩30%，作业一经批改评分，将不能修改；此次作业完成后应交到“在线作业”一栏本次作业界面中；作业必须按最后一页答卷表格格式作答，并且不要以附件形式缴交) 一．阅读： I arrived in the United States on February 6,1966, but I remember my first day here very clearly. My friend was waiting for me when my plane landed at Kennedy Airport at three o’clock in the afternoon. The weather was very cold and it was snowing, but I was too excited to mind. From the airport, my friend and I took a taxi to my hotel. On the way, I saw the skyline（轮廓）of Manhattan （曼哈顿）for the first time and I stared in astonishment at the famous skyscrapers and their man-made beauty. My friend helped me unpack at the hotel and then left me because he had to go back to work. He promised to return the next day. Shortly after my friend had left, I went to a restaurant near the hotel to get something to eat. Because I couldn’t speak a word of English, I couldn’t tell the waiter what I wanted. I was very upset and started to make some gestures(手势), but the waiter didn’t understand me. Finally, I ordered the same thing the man at the next table was eating. After dinner, I started to walk along Broadway until I came to Times Square with its movie theatres, neon lights（霓虹灯）, and huge crowds of people. I did not feel tired, so I continued to talk around the city. I wanted to see everything on my first day. I knew it was impossible, but I wanted to try. When I returned to the hotel, I was exhausted（筋疲力尽）, but I couldn’t sleep because I kept hearing the fire and police sirens（警笛声）during the night. I lay awake and thought about New York. It was a very big and interesting city with many tall buildings and big cars, and full of noise and busy people. I also decided right then that I had to learn to speak English. 1. On the way to his hotel, the writer______. a. was silent all the time
大学英语四级模拟题十 Part I Listening Comprehension (35’) Section A Directions:In this section, you will hear 10 short conversations and 1 long conversation. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A), B), C) and D), and decide which is the best answer. Then mark the corresponding letter on Answer Sheet with a single line through the center. 注意：此部分试题请在答题卡上对应题号作答。 1. A) At 9:15. B) Before 9:15. C) At 9:30. D) Before 9:50. 2. A) He does not understand it. B) He does not like it. C) He is used to it. D) He does not have to take it. 3. A) They were in a doctor’s office. B) They worked in the same office. C) They were in a workshop. D) They were talking in the weight lifting room at the gym. 4. A) Carry the suitcase with the woman. B) Carry the suitcase upstairs. C) Carry the suitcase up to the plane. D) Carry the suitcase down to the ship. 5. A) At eight o’clock. B) At nine o’clock. C) At ten o’clock. D) An hour later. 6. A) He broke his leg. B) He caught a cold. C) He had a car accident. D) He didn’t like to go to dance with the girl. 7. A) He doesn’t know what he wants to do. B) He likes to work this summer. C) He wonders whether the woman has a job. D) He can’t decide where to go on vacation. 8. A) At a hairdresser’s. B) At a tailor’s C) At a photographer’s. D) At a butcher’s. 9. A) The content of the note book. B) What the woman wrote in the note. C) Why people are not allowed to talk in the library. D) Whether people can smoke in the library. 10. A) Because it’s bad for her health. B) Because it had bad influences on children. C) Because it makes him smell. D) Because it makes him cough. Questions 11 to 15 are based on the conversation you have just heard. 11. A) He is not satisfied with his present job. B) He worries too much about his grandmother. C) People dislike his food. D) He is going to be fired. 12. A) He learned it in a training center of cooking. B) He learned it from his grandmother. C) He learned it from his mother. D) He learned it from his wife. 13. A) He dislikes other businessmen. B) He wants to have more chance to go on business. C) He doesn’t want to trouble others. D) He wants to be self-employed. 14. A) Whether he would have enough funds. B) Whether his food is to the customers’ taste. C) Whether his family members would support him. D) Whether he can pay less tax to the government. 15. A) Daniel gets encouragement from his friend Misha. B) The two speakers haven’t seen each other for a long time. C) Daniel wants to be in the food business. D) Daniel’s grandmother is an experienced businesswoman. Section B Directions: In this section, you will hear 2 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet with a single line through the center. 注意：此部分试题请在答题卡上对应题号作答。 Questions 16 to 20 are based on the passage you have just heard. 16. A) His age and appearance. B) His personality. C) His scholarship. D) His relationship with students. 17. A) No. Because he knows what he says in class will affect his students all their lives. B) Yes. But he never fails to apologize if he does. C) No. Because he is always well prepared before stepping onto the platform.