大学英语六级267及答案解析.doc

1、大学英语六级 267及答案解析(总分：448.05，做题时间：132 分钟)一、Part I Writing (3(总题数：1，分数：30.00)1.For this part you are allowed 30 minutes to write a composition on the topic Cyber Crimes. You should write no less than 150 words and base your composition on the outline (given in Chinese) below: 1网上犯罪的形式很多，如 2网上犯罪的根源 3如何打击

2、网上犯罪现象 （分数：30.00）_二、Part II Reading C(总题数：1，分数：71.00)Natural gas Vehicles Kermit the Frog once said, “Its not that easy beingreen.“ Although he wasnt referring to cars, his observation seems particularly appropriate for the auto industry today: Designing, developing and marketing “green“ cars has no

3、t been an easy task, which is why gasoline powered vehicles still rule the road and fossil fuels still account for almost 75 percent of the worlds energy consumption. As gasoline prices soar and concern over harmful emission mounts, however, cars that run on alternate fuel sources will become increa

4、singly important. A natural-gas vehicle, or NGV, is the perfect example of such a carits fuel-efficient, environmentally friendly and offers a relatively low cost of ownership. Natural Gas Basics The word “gas“ is a confusing term because it is used to describe many different substances that are sim

5、ilar but not exactly the same. For example, the “gas“ you put in your car is gasoline, one component of crude oil, or petroleum. Petroleum is a dark, sticky liquid mixture of compounds formed underground by the decay of ancient marine animals. Natural gas also comes from the decay of ancient organis

6、ms, but it naturally takes a gaseous form instead of a liquid form. Natural gas commonly occurs in association with crude oil. It is derived from both land plants and aquatic (水生的) organic matter and forms above or below oil deposits. It is often dissolved in crude oil at the high pressures existing

7、 in a reservoir. There are also reservoirs of natural gas, known as non-associated gas, that contain only gas and no oil. Natural gas consists primarily of methane (沼气) and other hydrocarbon gases. Hydrocarbons are organic compounds composed only of the elements carbon and hydrogen. The hydrocarbons

8、 in natural gas are called saturated hydrocarbons because they contain hydrogen and carbon bound together by single bonds. Like gasoline, natural gas is combustible (易燃的), which means it can be used in a combustion engine like gasoline. But cars that could burn natural gas didnt appear on the scene

9、until the 1930s. From Field to Ford We extract natural gas trapped in underground reservoirs by drilling wells into the earth. A modern well, equipped with diamond-studded drill bits, can drill to depths approaching 25,000 feet. Throughout the 19th century, the use of natural gas remained localized

10、because there was ho way to transport large quantities of gas over long distances. In 1890, the invention of a Teak-proof pipeline coupling made it possible to transport gas miles from the source. Improvements in pipeline technology continued over the next two decades until long-distance gas transmi

11、ssion became practical. From 1927 to 1931, laborers constructed more than 10 major natural gas transmission systems in the United States, making natural gas viable energy source for many applications. The oil shortages of the late 1960s and early 1970s “brought renewed interest in natural gas as a f

12、uel source, especially for automobiles! Today, owners of natural-gas vehicles can fill up their cars at one of 1,300 fueling stations located in the United States. Honda also offers a personal natural gas pump to people who purchase its natural-gas-powered Civic. The pump uses a homes existing natur

13、al gas lines and can be installed for $500 to $1500. Natural-gas Vehicle Design Natural-gas vehicles use the same basic principles as gasoline-powered vehicles. In other words, the fuel (natural gas in this case) is mixed with air in the cylinder of a four-stroke engine and then ignited by a spark p

14、lug to move a piston(活塞) up and down. Although there are some differences between natural gas and gasoline in terms of flammability and ignition temperatures. NGVs themselves operate on the same fundamental concepts as gasoline-powered vehicles. Still, some modifications are required to make an NGV

15、work efficiently. These changes are primarily in the fuel storage tank, the engine and the chassis (底盘). Advantages The biggest advantage of NGVs is that they reduce environmentally harmful emissions. Natural-gas vehicles can achieve up to a 93 percent reduction in carbon monoxide emissions, 33 perc

16、ent reduction in emissions of various oxides of nitrogen and a 50 percent reduction in reactive hydrocarbons when compared to gasoline vehicles. NGVs also rate higher in particulate matter 10 (PM10) emissions. PM10 particles transport and deposit toxic materials through the air. NGVs that operate in

17、 diesel applications can reduce PM10 emissions by a factor of 10. Natural-gas vehicles also offer these benefits: NGVs are safer. The fuel storage tanks on an NGV are thicker and stronger than gasoline or diesel tanks. There has not been an NGV fuel-tank rupture in more than two years in the United

18、States. Natural gas costs are lower than gasoline. On average, natural gas costs one-third less than gasoline at the pump. Natural gas is convenient and abundant. A well-established pipeline infrastructure exists in the United States to deliver natural gas to almost every urban area and most suburba

19、n areas. There are more than 1 ,300 NGV fueling stations in the United States, and more are being added every day. Natural gas prices have exhibited significant stability compared to oil prices. Historically, natural gas prices have exhibited significant price stability compared to the prices of pet

20、roleum-based fuels. This stability makes it easier to plan accurately for long-term costs. NGVs have lower maintenance costs. Because natural gas burns so cleanly, it results in less wear and tear on the engine and extends the time between tune-ups and oil changes. Disadvantages One of the biggest c

21、omplaints about NGVs is that they arent as roomy as gasoline cars. This is because NGVs have to give up precious cargo and trunk space to accommodate the fuel storage cylinders. Not only that, these cylinders can be expensive to design and builda contributing factor to the higher overall costs of a

22、Natural-gas vehicle compared to a gasoline-powered car. Another drawback is the limited driving range of NGVs, which is typically about half that of a gasoline-powered vehicle. For example, Hondas natural gas Civic, the Civic GX, can go up to 220 miles without refueling. A typical gasoline-powered C

23、ivic can go approximately 350 miles without refueling. If a dedicated NGV ran out of fuel on the road, it would have to be towed to the owners home or to a local natural gas refueling station, which might be harder to find than a “regular“ gas station. Finally, it should be noted that natural gas, l

24、ike gasoline, is a fossil fuel and cannot be considered a renewable resource. While natural gas reserves in the United States are still considerable, they are not inexhaustible. Some predict that there are enough natural gas reserves remaining to last another 67.1 years, assuming that the 2003 level

25、 of production continues. （分数：71.00）(1).This passage explains the basic idea of natural gas and compares the performances of different types of NGVs.（分数：7.10）A.YB.NC.NG(2).The basic principles applied to natural-gas vehicles are quite different from those applied to gasoline-powered vehicles.（分数：7.1

26、0）A.YB.NC.NG(3).More and more people are found of NGVs because they help reduce deaths in car accidents to a great degree.（分数：7.10）A.YB.NC.NG(4).The price of natural gas is cheaper and more stable than that of gasoline.（分数：7.10）A.YB.NC.NG(5).Often associated with crude oil, natural gas is principall

27、y made up of 1 and other hydrocarbon gases.（分数：7.10）填空项 1:_(6).NGVs arent as roomy as gasoline cars because they have to give up cargo and trunk space to accommodate the 1.（分数：7.10）填空项 1:_(7).Both natural gas and gasoline are 1 and thus neither can be considered renewable.（分数：7.10）填空项 1:_(8).During

28、the 19th century, natural gas was used on a local scale because of the difficult situation in 1.（分数：7.10）填空项 1:_(9).Natural gas trapped in underground reservoirs is extracted by 1.（分数：7.10）填空项 1:_(10).People resumed their interest in natural gas as a fuel as a result of 1of the late 1960s and early

29、1970s.（分数：7.10）填空项 1:_三、Listening Comprehens(总题数：1，分数：15.00)A.The man should break the candle into two.B.The man shouldnt work too hard for the happiness of future.C.The man should retire early.D.Todays happiness is less important than tomorrows.A.She meant he just waited till help came.B.She was af

30、raid something would go wrong with her car.C.She promised to help him herself.D.She meant she could make a phone call if anything went wrong.A.Bill will see Kate tomorrow evening.B.Bill might be at home late tomorrow evening.C.Bill and Kate have decided to go on a holiday.D.Bill asked the woman to c

31、ome another time.A.She never does things early.B.She has already finished it.C.She isnt going to finish it.D.She will finish it in a few minutes.A.He doesnt write well enough.B.He doesnt turn in the application.C.He hasnt got a professional experience.D.He didnt perform well in the interview.A.The w

32、oman is an excellent cook.B.The woman is a housewife.C.Cathy helped a lot in cooking the dish.D.The woman has never cooked before.A.The man thinks traveling by air is quite safe.B.The woman never travels by plane.C.Both speakers feel nervous when flying.D.The speakers feel sad about the serious loss

33、 of life.A.She had to wait for an appointment.B.She had other things to do first.C.Her foot had seemed all right.D.Her injury had kept him at home.四、Section A(总题数：2，分数：10.00)A.To get a library card.B.To get familiar with the resources there.C.To borrow some books he needs.D.To study how to use the c

34、omputer to locate the books in the library.A.The man used to live in the city.B.The library uses computer systems.C.The woman is ready to help.D.The man is confident of his computer skills.A.A city guide.B.A librarian.C.A computer expert.D.A registrar.A.The man wants to obtain an international drive

35、rs license that he can use both in the U. S. and in his country.B.The man wants to take a drivers test to get an Arizona drivers license.C.The man wants to know whether he can use his international drivers license in Arizona.D.The man wants to fill out an application for an Arizona drivers license.A

36、Less than one year.B.Five years.C.Four years.D.Ten years.A.Fill out an application.B.Go back to the university to get his ID.C.Go to see his friend.D.Take a written exam and an eve exam.五、Section B(总题数：3，分数：30.00)A.Because he was a famous English writer.B.Because he enjoyed walking along the street

37、C.Because he had a good memory.D.Because he was proud of his own ability.A.For they are not hard-working.B.For they dont have good memories.C.For they havent enough time for it.D.For they are busy with their own language.A.Mind takes clearer photos of what we see.B.Mind takes pictures of all five s

38、enses.C.Mind spends less time taking pictures.D.Mind keeps photos for longer time.A.Picture taking.B.Memory.C.Language learning.D.Poem writing.A.They published scientific evidence to determine second hand smoke as a cause of cancer.B.They denied the suspicion that second hand smoke may cause cancer.

39、C.They discovered all the causes of cancer.D.They agreed that moderate smoke wont cause cancer.A.He worked for a medical periodical.B.He published a paper about computer science.C.He suggested a link between smoke and lung cancer.D.He opened a hospital with his partner.A.Whether second hand smoking

40、is liked with cancer.B.Whether active smoking is linked with cancer.C.Whether passive smoking by children is liked with childhood cancers.D.Whether an average degree of passive smoking is harmful.A.He could do without any food before getting home.B.He would stay in Sweden for a long time.C.He would

41、find no food served on board.D.He couldnt get home without having meals on board.A.Because he didnt feel very well.B.Because he overslept and missed the lunch.C.Because he didnt hear the lunch bell.D.Because he thought he couldnt afford it.A.At lunchtime.B.Later than breakfast time.C.As soon as he h

42、eard the breakfast bell.D.In time to have his breakfast.A.He had already paid for the meals when he bought his ticket.B.He had to pay for every meal he had on board.C.The meals were served free of charge.D.He could not have the bill.六、Section C(总题数：1，分数：10.00)In bringing up children, every parent wa

43、tches eagerly the childs (36) 1 of each new skill the first spoken words, the first (37) 2steps, or the beginning of reading and writing. It is often (38) 3to hurry the child beyond his natural learning rate, but this can set up dangerous feelings of failure and states of worry in the child. This mi

44、ght happen at any stage. A baby might be (39) 4to use a toilet too early, a young child might be (40) 5to learn to read before he knows the meaning of the words he reads. On the other hand, though, if a child is left alone too much, or without any learning (41) 6, he loses his natural (42) 7for life

45、 and his (43) 8to find out new things for himself. (44) 9. Some may be especially strict in money matters. Other are sever over times of coming home at night or punctuality for meals. In general, the controls imposed represent the needs of the parents and the values of the community as much as the c

46、hilds owns happiness. As regards the development of moral standards in the growing child, consistency is very important in parental teaching. (45) 10. Also, parents should realize that example is better than precept. “If they are not sincere and do not practice what they preach, (46) 11. A sudden aw

47、areness of a marked difference between their parents principles and their morals can be a dangerous disappointment. （分数：10.00）填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_七、Reading Comprehensio(总题数：2，分数：177.00)“Ive never met a human worth cloning,“ says cloning expert

48、 Mark Westhusin from his lab at Texas A hes put up $ 3.7 million so far to fund A the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.“ Perhaps his message was to tolerate the objectors, the eccentrics, and in general those who disagree with what we know is right so long as they dont become too violent. Tolerate them. not out of any sense of humanity but for foo