2021年大学英语四级考试试题及答案.doc

1月大学英语四级考试试题试卷一Part I Listening Comprehension (20 minutesSection A1. A) The woman is s close friend of the man. B) The woman has been working too hard.C) The woman is seeing a doctor. D) The woman is tired of her work.2. A) This apple pie tastes very good. B) His mother likes the pie very muchC) This pie cant match his mothers. D) His mother cant make apple pies.3. A) Take a walk. B) Give a performance.C) Listen to the music. D) Dance to the music.4. A) Read an article on political science. B) Present a different theory to the class. C) Read more than one article. D) Choose a better article to read.5. A) The woman would understand if she did Marys job. B) The woman should do the typing for Mary. C) The woman should work as hard as Mary. D) The woman isnt a skillful typist.6. A) He wants to make an appointment with Mr. Smith. B) He wants to make sure that Mr. Smith will see him. C) He wants to change the time of the appointment. D) He wants the woman to meet him at three oclock.7. A) He gets nervous vastly. B) He is an inexperienced speaker. C) He is an awful speaker. D) He hasnt prepared his speech well.8. A) She didnt like the books the man bought. B) There wasnt a large selection at the bookstore. C) The man bought a lot of books. D) She wanted to see what the man bought.9. A) Buy a ticket for the ten oclock flight. B) Ask the man to change the ticket for her. C) Go to the airport immediately. D) Switch to a different flight.10. A) Dr. Lemon is waiting for a patient.B) Dr. Lemon is busy at the moment.C) Dr. Lemon has lost his patience.D) Dr. Lemon has gone out to visit a patient.Section B Passage One Questions 11 to 14 are based on the passage you have just heard.11. A) A car outside the supermarket. B) A car at the bottom of the hill.C) Pauls car. D) The sports car.12. A) Inside the car. B) At the foot of the hill.C) In the garage. D) In the supermarket.13. A) The driver of the sports car. B) The two girls inside the car.C) The bus driver. D) Paul.14. A) Nobody. B) The two girls. C) The man standing nearby. D) The salesman from London.Passage Two Questions 15 to 17 are based on the passage you have just heard.15. A) His friend gave him the wrong key. B) He didnt know where the back door was.C) He couldnt find the key to his mailbox. D) It was too dark to put the key in the lock.16. A) It was getting dark. B) He was afraid of being blamed by his friend.C) The birds might have flown away. D) His friend would arrive any time.17. A) He looked silly with only one leg inside the window.B) He knew the policeman wouldnt believe him.C) The torchlight made him look very foolish.D) He realized that he had made a mistake. Passage Three Questions 18 to 20 are based on the passage you have just heard.18. A) The threat of poisonous desert animals and plants.B) The exhaustion of energy resources.C) The destruction of oil wells.D) The spread of the black powder from the fires.19. A) The underground oil resources have not been affected.B) Most of the desert animals and plants have managed to survive.C) The oil lakes soon dried up and stopped evaporating.D) The underground water resources have not been polluted.20. A) To restore the normal production of the oil wells.B) To estimate the losses caused by the fires.C) To remove the oil left in the desert.D) To use the oil left in the oil lakes. Part Reading Comprehension (35 minutes) Passage One Questions 21 to 25 are based on the following passage.Unless we spend money to spot and prevent asteroids(小行星)now，one might crash into Earth and destroy life as we know it，say some scientists.Asteroids are bigger versions of the meteoroids(流星)that race across the night sky. Most orbit the sun far from Earth and dont threaten us. But there are also thousands whose orbits put them on a collision course with Earth.Buy $50 million worth of new telescopes right now. Then spend $10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one，the scientists say，well have a way to change its course.Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldntbe cheap.Is it worth it?Two things experts consider when judging any risk are：1) How likely the event is；and 2) How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 500,000 years. Sounds pretty rarebut if one did fall，it would be the end of the world. “If we dont take care of these big asteroids，theyll take care of us,” says one scientist. “Its that simple.”The cure，though，might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth?“The world has less to fear from doomsday(毁灭性) rocks than from a great nuclear fleet set against them,” said a New York Times article.21. What does the passage say about asteroids and meteoroids? A) They are heavenly bodies different in composition. B) They are heavenly bodies similar in nature. C) There are more asteroids than meteoroids. D) Asteroids are more mysterious than meteoroids.22. What do scientists say about the collision of an asteroid with Earth? A) It is very unlikely but the danger exists. B) Such a collision might occur once every 25 years. C) Collisions of smaller asteroids with Earth occur more often than expected. D) Its still too early to say whether such a collision might occur.23. What do people think of the suggestion of using nuclear weapons to alter the course of asteroids? A) It sounds practical but it may not solve the problem. B) It may create more problems than it might solve.C) It is a waste of money because a collision of asteroids with Earth is very unlikely. D) Further research should be done before it is proved applicable.24. We can conclude from the passage that .A) while pushing asteroids off course nuclear weapons would destroy the worldB) asteroids racing across the night sky are likely to hit Earth in the near futureC) the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetimeD) workable solutions still have to be found to prevent a collision of asteroids with Earth.25. Which of the following best describes the authors tone in this passage?A) Optimistic. B) Critical. C) Objective. D) Arbitrary.Passage Two Questions 26 to 30 are based on the following passage.Believe it or not，optical illusion (错觉) can cut highway crashes.Japan is a case in point. It has reduced automobile crashes on some roads by nearly 75 percent using a simple optical illusion. Bent stripes，called chevrons (人字形) painted on the roads make drivers think that they are driving faster than they really are，and thus drivers slow down.Now the American Association Foundation for Traffic Safety in Washington D.C is planning to rep eat Japans success. Starting next year，the foundation will paint chevrons and other patterns of stripes on selected roads around the country to test how well the patterns reduce highway crashes.Excessive speed plays a major role in as much as one fifth of all fatal traffic accidents，according to the foundation. To help reduce those accidents，the foundation will conduct its tests in areas where speed-related hazards are the greatest-curves，exit slopes，traffic circles，and bridges.Some studies suggest that straight，horizontal bars painted across roads can initially cut the average speed of drivers in half. However，traffic often returns to full speed within months as drivers become used to seeing the painted bar. Chevrons，scientists say，not only give drivers the impression that they are driving faster than they really are but also make a lane spear to be narrower. The result is a longer lasting reduction in highway speed and the number of traffic accidents.26. The passage mainly discusses .A) a new way of highway speed controlB) a new pattern for painting highwaysC) a new approach to training driversD) a new type of optical illusion27. On roads painted with chevrons drivers tend to feel that .A) they should avoid speed-related hazardsB) they are driving in the wrong laneC) they should slow down their speedD) they are approaching the speed limit28. The advantage of chevrons over straight，horizontal bars is that the former .A) can keep drivers awakeB) can cut road accidents in halfC) will have a longer effect on driversD) will look more attractive29. The American Association Foundation for Traffic Safety plans to .A) try out the Japanese method in certain areasB) change the road signs across the countryC) replace straight，horizontal bars with chevronsD) repeat the Japanese road patterns30. What does the author say about straight，horizontal bars painted across roads?A) They are falling out of use in the United States.B) They tend to be ignored by drivers in a short period of time.C) They are applicable only on broad roads.D) They cannot be applied successfully to traffic circles. Passage Three Questions 31 to 35 are based on the following passage.Amtrak (美国铁路客运公司) was experiencing a downswing in ridership (客运量) along the lines comprising its rail system. Of major concern to Amtrak and its advertising agency DDB Needham， were the long-distance western routes where ridership had been declining significantly.At one time，trains were the only practical way to cross the vast areas of the west. Trains were fast，very luxurious，and quite convenient compared to other forms of transportation existing at the time. However，times change and automobile became Americas standard of convenience. Also，air travel had easily established itself as the fastest method of traveling great distances. Therefore，the task for DDB Needham was to encourage consumers to consider other aspects of train travel in order to change their attitudes and increase the likelihood that trains would be considered for travel in the west.Two portions of the total market were targeted：1) anxious fliers-those concerned with safety，relaxation，and cleanliness and 2) travel-lovers-those viewing themselves as relaxed，casual，and interested in the travel experience as part of their vacation. The agency then developed a campaign that focused on travel experiences such as freedom，escape，relaxation，and enjoyment of the great western outdoors. It stressed experiences gained by using the trains and portrayed western train trips as wonderful adventures.Advertisements showed pictures of the beautiful scenery that could be enjoyed along some of the more famous western routes and emphasized the romantic names of some of these trains (Empire Builder，etc.). These ads were strategically placed among family-oriented TV shows and programs involving nature and America in order to most effectively reach target audiences. Results were impressive. The Empire Builder，which was focused on in one ad，enjoyed a 15 percent increase in profits on its Chicago to Seattle route.31. Whats the authors purpose in writing this passage?A) To show the inability of trains to compete with planes with respect to speed and convenience.B) To stress the influence of the automobile on Americas standard of convenience.C) To emphasize the function of travel agencies in market promotion.D) To illustrate the important role of persuasive communication in changing consumer attitudes.32. It can be inferred from the passage that the drop in Amtrak rider ship was due to the fact that .A) trains were not suitable for short distance passenger transportationB) trains were not the fastest and most convenient form of transportationC) trains were not as fast and convenient as they used to beD) trains could not compete with planes in terms of luxury and convenience33. To encourage consumers to travel by train，DDB Needham emphasized .A) the freedom and convenience provided on trainsB) the practical aspects of travelC) the adventurous aspects of train tripsD) the safety and cleanliness of train trips34. The train ads were placed among family-oriented TV programs involving nature and America because . A) they could focus on meaningful travel experiences B) they could increase the effectiveness of the TV programs C) their profits could be increased by some 15 percent D) most travel-lovers and nervous fliers were believed to be among the audiences35. According to the passage，the Empire Builder enjoyed an increase in rider ship and profits because . A) the attractiveness of its name and route was effectively advertised B) it provided an exciting travel experience C) its passengers could enjoy the great western outdoors D) it was widely advertised in newspapers and magazines in Chicago and Seattle Passage Four Questions 36 to 40 are based on the following passage.Why does cream go bad faster than butter?Some researchers think they have the answer，and it comes down to the structure of the food，not its chemical compositiona finding that could help rid some processed foods of chemical preservatives.Cream and butter contain pretty much the same substances，so why cream should sour much faster has been a mystery. Both are emulsionstiny globules (小球体) of one liquid evenly distributed throughout another. The difference lies in whats in the globules and whats in the surrounding liquid，says Brocklehurst，who led the investigation.In cream，fatty globules drift about in a sea of water. In butter，globules of a watery solution are locked away in a sea of fat. The bacteria which make the food go bad prefer to live in the watery regions of the mixture. “This means that in cream，the bacteria are free to grow throughout the mixture,” he says.When the situation is reversed，the bacteria are locked away in compartments (隔仓室) buried deep in the sea of fat. Trapped in this way，individual colonies cannot spread and rapidly run out of nutrients (养料). They also slowly poison themselves with their waste products. “In butter，you get a self-limiting system which stops the bacteria growing.” says Brocklehurst.The researchers are already working with food companies keen to see if their products can be made resistant to bacterial attack through alterations to the foods structure. Brockiehurst believes it will be possible to make the emulsions u