全国大学英语四级考试试题二.docx

1、全国大学英语四级考试试题二2012年6月全国大学英语四级考试试题（二）Part I Writing (30 minutes)Directions:For this part, you are allowed 30 minutes to write a composition on the topic Should Smoking Be Completely Banned. You should write at least 120 words following the outline given below in Chinese:1. 有人赞同完全禁止吸烟，理由是2. 有人不赞同完全禁止吸烟

2、，理由是3. 我的看法。Should Smoking Be Completely BannedPart II Reading Comprehension (Skimming and Scanning)(15 minutes)Directions:In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1.For questions 1-7,choose the best answer from the four choices m

3、arked A,B,Cand D. For questions 8-10,complete the sentences with the information given in the passage。 SpaceOur Future in Space: It Has Already Begun!We are all space travelers. But weve stayed close to home until now. One day, we may leave our “mother ship” Earth to make our home among the stars。A

4、giant, spherical “spaceship”， about 8,000 miles in diameter, is speeding through the solar system right now. It is cruising at an incredible 66,600 miles per hour。Its not a giant, Star Wars mother ship. Its spaceship Earth, the home of over four billion people. This water coated spaceship has been t

5、raveling through the universe for about five billion years. Only within the past 25 years, however, have some of its passengers broken free of Earths gravity。But 25 years from now, many people, including you, might live in an orbiting space station 200 miles above the Earth。Space CitiesScientists ha

6、ve already designed special space factories. These factories will take advantage of the absence of gravity (zero gravity) to produce everything from life-saving drugs to perfect ball bearings。Other scientists have designed space colonies, complete with farms, schools, and artificial day and night. H

7、undreds, or even thousands, of people will live, work, playeven go to school, far above the Earth。Our conquest of space, of course, has already begun. We have explored part of the Moon, sent robot spaceships onto the surface of Venus and Mars, and aimed space probes past the planets of Jupiter and S

8、aturn。Last June, one robot ship, Pioneer 10, left our solar system forever. And astronauts from both the Soviet Union and the United States have lived in space stations。The conquest of space, without question, is one of the greatest adventures human beings have ever set out on. But it may be more th

9、an a great adventure. Some scientists think the conquest of space may be a necessity for survival of the human species。We are tearing up more and more of the Earth to get raw materials for industry. And we are polluting the air and water as we manufacture products that we need or want. Almost everyt

10、hing that seems to make our lives more comfortable, and from electricity to pesticides, uses up or alters a piece of our planets natural environment。Why Go into Space?Yet our solar system is full of resources. The moon is chockfull of valuable metals. So are the asteroids, the small, rocky, planet-l

11、ike bodies orbiting the sun most of them between Mars and Jupiter. These metals, if we can get them, could be used to build factories and space stations. Also, in space, there is no atmosphere to filter out the suns energy. There is plenty of solar energy to be turned into electricity for manufactur

12、ing, for creating comfortable living conditions。Getting away from Earth has other advantages, too. Modern industry uses many kinds of metal alloys (mixtures of metal that are better for certain purposes than pure metals). Yet some metal alloys either cant be made or are very expensive to make on Ear

13、th because of gravity. For instance, certain metals dont mix well on Earth. But in zero gravity, molten (hot, liquid) metals mix more evenly. This is because there is no gravity to pull the heavier metals down, while the lighter ones float on top。From space, too, we can look down on the Earth and st

14、udy the atmosphere, its weather, and the effects of air pollution。And because there is no strong gravity to break free from, our future homes away from Earth will be convenient starting points for travel to distant planets。But, while going into space might solve some problems, outer space can also b

15、e a dangerous place. For example, in outer space, we have to protect ourselves from the dangers of ultraviolet light and cosmic rays. Ultraviolet light from the sun can give us bad sunburns right here on Earth. Yet, Earths atmosphere screens out most of that harmful radiation. Cosmic rays are tiny h

16、igh energy particles from outer space. Again, the Earth shields us from most of them。At Home in Space?But in space, without special protection, we would be exposed to much stronger radiation from ultraviolet light and cosmic rays. Also, in the zero gravity of outer space, our bones will lose calcium

17、 and become weaker. This will be more of a problem the longer people stay out in space. Doctors are looking for a way to keep our bones from losing calcium in outer space. And a small spaceship just might “drive you batty” after a while. But even on a short trip in outer space, you might not feel as

18、 well as youd like to. Space travel could make you seasick!Yet, these risks wont keep people from going into space. Eventually, an Earth-like environment will be built in space. And they will be populated by people with many different interests: medicine, construction, farming, teaching, mining, and

19、 so on。The next hundred years will be filled with other worldly adventures, exciting scientific discoveries, and danger, as humans leave Earthperhaps forever。Aging in SpaceSuppose a space traveler is moving at a velocity of 186,200 miles per second. For every hour that passes for him, 30 hours pass

20、on Earth. If he travels for a year in this fashion (having accelerated instantaneously) and then turns around and comes back at this speed (having turned around instantaneously)， he will find that while he has seemed to himself to have traveled two years, the men on Earth would claim he had been abs

21、ent for 30 years。Suppose the space traveler had left at the age of 30, leaving behind a twin brother also aged 30. When he returned he would be 32, but his stay-at-home twin brother would be 60. That is why the “clock paradox”， is sometimes called the “twin paradox”。Of course it takes quite a long w

22、hile to accelerate to a high speed, and a long while to make a turn and head back again, so conditions arent quite as clear cut as just described。c1.The giant, spherical spaceship mentioned in the passage is。Athe outer spaceBa man-made spaceshipCthe planet EarthDthe Star Wars mother-shipb2.Some pers

23、ons have traveled into outer space after conqueringwithin the past 25 years。Athe universeBEarths gravityCthe earth Douter spacec3.We have explored or sent robot spaceships to the following space except。Athe moonBVenusCJupiterDMars cbcbcacb4.Why is the conquest of space more than a great adventure?AB

24、ecause it is full of challenges for human beings。BBecause it may be necessary for human beings to survive。CBecause it is the greatest adventure in human history。DBecause it is more exciting than any other adventures。c5.The moon and the asteroids are alike with respect to their 。Asize and moving ways

25、 Bcomfortable living conditionsCrich and valuable metalsDsolar energya6.Why cant ultraviolet light scorch our skin on Earth as seriously as it does in space places?ABecause the Earths atmosphere can make ultraviolet light less harmful。BBecause ultraviolet cant reach the Earth at all。CBecause the Ear

26、th is far away from those planets radiating ultraviolet light。DBecause other space places is near from those planets radiating ultraviolet light。c7.In spite of many risks, scientists will finally buildin space suitable for humans to live。Aan environment without ultraviolet lightBa lot of homesCan Ea

27、rth-like environmentDan environment with atmosphere8.The reason some metal alloys cant be made on Earth is that the heavier metals _do not mix well_together with the lighter ones。9.In space, there is no atmosphere to filter out the suns energy. There is plenty of solar energy to be turned into_elect

28、ricity for manufacturing_ , for creating comfortable living conditions。10.According to the author,_ the losing of calcium_ will be caused to a man in gravity-free space。Part III Listening Comprehension (35 minutes)SectionADirections: In this section, you will hear 8 short conversations and 2 long co

29、nversations. 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, Cand D, and decide which i

30、s the best answer. Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre。11.ATennis equipment。BVolleyball equipment。CFootball equipment。DBasketball equipment。12.AHe must meet his teacher。BHe must attend a class。CHe must go out with his girlfriend。DHe must stay at

31、 school to finish his homework。13.AIts not as good as it was.BIts better than it used to be。CIts better than people say.DIts even worse than people say。14.ABecause he doesnt like football。BBecause Maria fell ill。CBecause he didnt have the time。DBecause Maria cant stand football。15.AA temporary job。BA permanent job。CSome money for the vacation。DSome money for the university fees。16.AThe woman did most of the talking。BThe man did most of the talking。CThe