bsp; 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) It's 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 world B) asteroids racing across the night sky are likely to hit Earth in the near future C) the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime D) workable solutions still have to be found to prevent a collision of asteroids with Earth. 25. Which of the following best describes the author's tone in this pass age? A) Optimistic. B) Critical. C) Objective. D) Arbitrary.
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 nea rly 75 percent using a simple optical illusion.Bent stripes，called chevrons (人字形)painted on the roads make drivers think that they are d riving 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 Japan's 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 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 c ircles，and bridges.Some studies suggest that straight，horizontal bars painted across roads can initially cut the average speed of drivers in half.However，t raffic often returns to full speed within months as drivers become used to seeing the painted bar.Chevrons，scientists say，not only give drivers the impress ion that they are driving faster than they really are but also make a lane sppea r 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 control B) a new pattern for painting highways C) a new approach to training drivers D) a new type of optical illusion 27. On roads painted with chevrons drivers tend to feel that. A) they should avoid speed - related hazards B) they are driving in the wrong lane C) they should slow down their speed D) they are approaching the speed limit 28. The advantage of chevrons over straight，horizontal bars is that the former . A) can keep drivers awake B) can cut road accidents in half C) will have a longer effect on drivers D) will look more attractive 29. The American Association Foundation for Traffic Safety plans to . A) try out the Japanese method in certain areas B) change the road signs across the country C) replace straight，horizontal bars with chevrons D) repeat the Japanese road patterns 30. What does the author say about straight，horizontal bars painted acr oss 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.. Questions 31 to 35 are based on the following passage: Amtrak(美国铁路客运公司)was experiencing a downswing in riders hip (客运量)along the lines comprising its rail system.Of major concern t o Amtrak and its advertising agency DDB Needham，were the long - distance wester n routes where ridership had been declining significantly.At one time，trains w ere the only practical way to cross the vast areas of the west.Trains were fast，ver，'luxurious，and quite convenient compared to other forms of transportation existing at the time.However，times change and the automolile became America's 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 t o change their attitudes and increase the likelihood that trains would be consid ered for travel in the west.Two portions of the total market were targeted: 1) anxious fliers - those concermed with safety，relaxation，and cleanliness and 2) travel - lovers - those viewing themselves as relaxed，casual，and interested in the travel ecperience 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 u sing the trains and portrayed western train trips as wonderful adventures.Adver tisements showed pictures of the beautiful scenery that could be enjoyed along s ome 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 t o most effectively reach target audiences.Resultswere impressive.The Empire Bu ilder.Which was focused on in one ad.enjoyed a 15 percent increase in profits on its Chicago to Seattle route.
31. What's the author's 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 America's standard of convenience. C) To emphasize the function of travel agencies in market promotion. D) To illustrate the important role of persuasive communiation in changing consum- er attitudes. 32. It can be inferred from the passage that the drop in Amtrak ridership was due to the fact that ______ . A) trains were not suitable for short distance passenger transportation B) trains were not the fastest and most convenient form of transportation C) trains were not as fast and convenient as they used to be D) trains could not compete with planes in terms of luxury and convenience
33. To encourage consumers to travel by train，DDB Needham emphasized ______ . A) the freedom and convenience provided on trains B) the practical aspests of travel C) the adventurous aspects of train trips D) the safety and cleanliness of train trips 34. The train ads were placed among family - oriented TV programs involv ing 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 audiences 35. According to the passage，the Empire Builder enjoyed an increase in ridership 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 Questions 36 to 40 are based on the following passage: Why does cream go bad faster than butter? Some researchers think they the answer，and it comes down to the structure of the food，not its chemical composition - a finding that could help rid some processed foods of chemical preservatives.C ream and butter contain pretty much the same substances，so why cream should sou r muchfaster has been a mystery.Both are emulsions - tiny
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