大学英语六级改革适用（阅读）-试卷201及答案解析.doc

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1、大学英语六级改革适用（阅读）-试卷 201及答案解析(总分：60.00，做题时间：90 分钟)一、Reading Comprehensio(总题数：6，分数：60.00)1.Part III Reading Comprehension（分数：10.00）_2.Section C（分数：10.00）_Wild Bill Donovan would have loved the Internet. The American spymaster who built the Office of Strategic Services in World War II and late laid the r

2、oots for the CIA was fascinated with information. Donovan believed in using whatever tools came to hand in the “great game“ of espionagespying as a “profession“. These days the Net, which has already remade such everyday pastimes as buying books and sending mails, is reshaping Donovans vocation as w

3、ell. The latest revolution isnt simply a matter of gentlemen reading other gentlemens e-mail. That kind of electronic spying has been going on for decades. In the past three or four years, the World Wide Web has given birth to a whole industry of point-and-click spying. The spooks call it “open-sour

4、ce intelligence“, and as the Net grows, it is becoming increasingly influential. In 1995 the CIA held a contest to see who could compile the most data about Burundi. The winner, by a large margin, was a tiny Virginia company called Open Source Solutions, whose clear advantage was its mastery of the

5、electronic world. Among the firms making the biggest splash in this new world is Stratford, Inc., a private intelligence-analysis firm based in Austin, Texas. Stratford makes money by selling the results of spying(covering nations from Chile to Russia)to corporations like energy-services firm McDerm

6、ott International. Many of its predictions are available online at www. Stratford. com. Stratford president George Friedman says he sees the online world as a kind of mutually reinforcing tool for both information collection and distribution, a spymasters dream. Last week his firm was busy vacuuming

7、 up data bits from the far corners of the world and predicting a crisis in Ukraine. “As soon as that report runs, well suddenly get 500 new Internet sign-ups from Ukraine,“ says Friedman, a former political science professor. “And well hear back from some of them.“ Open-source spying does have its r

8、isks, of course, since it can be difficult to tell good information from bad. Thats where Stratford earns its fame. Friedman relies on a lean staff of 20 in Austin. Several of his staff members have military-intelli-gence backgrounds. He sees the firms outsider status as the key to its success. Stra

9、tfords briefs dont sound like the usual Washington back-and-forthing, whereby agencies avoid dramatic declarations on the chance they might be wrong. Stratford, says Friedman, takes pride in its independent voice.（分数：10.00）(1).What can we learn about Bill Donovan?（分数：2.00）A.He was skilled in searchi

10、ng information in the Internet.B.He used to serve the CIA during the Second World War.C.He took the “great game“ of espionage as a profession.D.He had a new job that was closely related with the Net.(2).What is becoming increasingly influential as it is pointed out in the second paragraph?（分数：2.00）A

11、.The industry of spying.B.The World Wide Web.C.The data found in the Net.D.The latest Net revolution.(3).In the third paragraph, Chile and Russia are two countries _.（分数：2.00）A.in which Stratford finds its major clientsB.which McDermott International cooperates withC.about which Stratford finds info

12、rmation for its clientsD.whose development has been boosted by Stratfords predictions(4).What makes Stratford the most successful spying firm is that _.（分数：2.00）A.it can find relevant data from any comer of the worldB.it uses the Net in collecting and distributing informationC.it is able to distingu

13、ish the good information from the badD.it gets much feedback from the clients from all over the world(5).It can be inferred that people use back-and-forthing in order to _.（分数：2.00）A.be independent of any influenceB.make an official declarationC.apologize for any mistakesD.shift any possible blameWe

14、 sometimes think humans are uniquely vulnerable to anxiety, but stress seems to affect the immune defenses of lower animals too In one experiment, for example, behavioral immunologist(免疫学家)Mark Laudenslager, at the University of Denver, gave mild electric shocks to 24 rats. Half the animals could sw

15、itch off the current by turning a wheel in their enclosure, while the other half could not The rats in the two groups were paired so that each time one rat turned the wheel it protected both itself and its helpless partner from the shock. Laudenslager found that the immune response was depressed bel

16、ow normal in the helpless rats but not in those that could turn off the electricity. What he has demonstrated, he believes, is that lack of control over an event, not the experience itself, is what weakens the immune system. Other researchers agree. Jay Weiss, a psychologist at Duke University Schoo

17、l of Medicine, has shown that animals who are allowed to control unpleasant stimuli dont develop sleep disturbances or changes in brain chemistry typical of stressed rats. But if the animals are confronted with situations they have no control over, they later behave passively when faced with experie

18、nces they can control. Such findings reinforce psychologists suspicions that the experience or perception of helplessness is one of the most harmful factors in depression. One of the most startling examples of how the mind can alter the immune response was discovered by chance. In 1975 psychologist

19、Robert Ader at the University of Rochester School of Medicine conditioned(使形成条件反射)mice to avoid saccharin(糖精)by simultaneously feeding them the sweetener and injecting them with a drug that while suppressing their immune systems caused stomach upsets. Associating the saccharin with the stomach pains

20、, the mice quickly learned to avoid the sweetener. In order to extinguish this dislike for the sweetener, Ader reexposed the animals to saccharin, this time without the drug, and was astonished to find that those mice that had received the highest amounts of sweetener during their earlier conditioni

21、ng died. He could only speculate that he had so successfully conditioned the rats that saccharin alone now served to weaken their immune systems enough to kill them.（分数：10.00）(1).Laudenslagers experiment showed that the immune system of those rats who could turn off the electricity _.（分数：2.00）A.was

22、strengthenedB.was not affectedC.was alteredD.was weakened(2).According to the passage, the experience of helplessness causes rats to _.（分数：2.00）A.try to control unpleasant stimuliB.turn off the electricityC.behave passively in controllable situationsD.become abnormally suspicious(3).The reason why t

23、he mice in Aders experiment avoided saccharin was that_.（分数：2.00）A.they disliked its tasteB.it affected their immune systemsC.it led to stomach painsD.they associated it with stomachaches(4).The passage tells us that the most probable reason for the death of the mice in Aders experiment was that _.（

24、分数：2.00）A.they had been weakened psychologically by the saccharinB.the sweetener was poisonous to themC.their immune systems had been altered by the mindD.they had taken too much sweetener during earlier conditioning(5).It can be concluded from the passage that the immune systems of animals _.（分数：2.

25、00）A.can be weakened by conditioningB.can be suppressed by drug injectionsC.can be affected by frequent doses of saccharinD.can be altered by electric shocksIf you go down to the woods today, you may meet high-tech treesgenetically modified to speed their growth or improve the quality of their wood.

26、 Genetically-engineered food crops have become increasingly common, albeit controversial, over the past ten years. But genetic engineering of trees has lagged behind. Part of the reason is technical. Understanding, and then altering, the genes of a big pine tree are more complex than creating a bett

27、er tomato. While tomatoes sprout happily, and rapidly, in the laboratory, growing a whole tree from a single, genetically altered cell in a test tube is a tricky process that takes years, not months. Moreover, little is known about tree genes. Some trees, such as pine trees, have a lot of DNAroughly

28、 ten times as much as human. And, whereas the Human Genome Project is more than half-way through its task of isolating and sequencing the estimated 100, 000 genes in human cells, similar efforts to analyze tree genes are still just saplings(幼苗). Given the large number of tree genes and the little th

29、at is known about them, tree engineers are starting with a search for genetic “markers“. The first step is to isolate DNA from trees with desirable properties such as insect resistance. The next step is to find stretches of DNA that show the presence of a particular gene. Then, when you mate two tre

30、es with different desirable properties, it is simple to check which offspring contain them all by looking for the genetic markers. Henry Amerson, at North Carolina State University, is using genetic markers to breed fungal resistance into southern pines. Billions of these are grown across America fo

31、r pulp and paper, and outbreaks of disease are expensive. But not all individual trees are susceptible. Dr. Amersons group has found markers that distinguish fungus-resistant stock from disease-prone trees. Using traditional breeding techniques, they are introducing the resistance genes into pines o

32、n test sites in America. Using genetic markers speeds up old-fashioned breeding methods because you no longer have to wait for the tree to grow up to see if it has the desired traits. But it is more a sophisticated form of selective breeding. Now, however, interest in genetic tinkering(基因修补)is also

33、gaining ground. To this end, Dr. Amerson and his colleagues are taking part in the Pine Gene Discovery Project, an initiative to identify and sequence the 50,000-odd genes in the pine trees genome Knowing which gene does what should make it easier to know what to alter.（分数：10.00）(1).Compared with ge

34、netic engineering of food crops, genetic engineering of trees _.（分数：2.00）A.began much laterB.has developed more slowlyC.is less usefulD.was less controversial(2).What does the author think about the genetic engineering of pine trees?（分数：2.00）A.Time-consuming.B.Worthwhile.C.Significant.D.Technically

35、impossible.(3).What can we learn about the research on tree genes?（分数：2.00）A.The research methods are the same as the analysis of human genes.B.The findings are expected to be as fruitful as the analysis of human genes.C.It will take as much time and effort as the analysis of human genes.D.The resea

36、rch has been mainly concentrated on the genes of young trees.(4).It is discovered by Henry Amersons team that_.（分数：2.00）A.southern pines cannot resist fungusB.all southern pines are not susceptibleC.the genetic marker in southern pines was the easiest to identifyD.fungus-resistant genes came origina

37、lly from outside the U.S.A.(5).What is the primary objective of carrying out the Pine Gene Discovery Project?（分数：2.00）A.To speed up old-fashioned breeding methods.B.To identify all the genes in the pine trees genome.C.To find out what desired traits the pine trees have.D.To make it easier to know wh

38、ich gene needs altering.If our solar system has a Hell, its Venus. The air is choked with foul and corrosive sulfur, heaved from ancient volcanoes and feeding acid clouds above. Although the second planet is a step farther from the sun than Mercury, a runaway greenhouse effect makes it hotter indeed

39、 Its the hottest of the nine plants, a toasty 900 degrees Fahrenheit of baking rocky flats from equator to poles. All this under a crushing atmospheric pressure 90 times that of where youre sitting now. From the earthly perspective, a dead end. It must be lifeless. “Venus has nothing,“ is the blunt

40、word from planetologist Kevin Zahnle of NASA Ames Research Center in Californias Silicon Valley. “Weve written it off.“ Yet a small group of advanced life-forms on Earth begs to differ, and theorizes that bizarre microbial ecosystems might have once populated Venus and, in fact, may be there still.

41、Members of this loose band of researchers suggest that their colleagues have water too much on the brain, and are, in a sense, H 2 O chauvinists(盲目的爱国者). “Astrobiologists are neglecting Venus due more to narrow thinking than actual knowledge of the environment, or environments, where life can thrive

42、,“ says Dirk Schulze-Makuch, a geobiologist at the University of Texas at El Paso who recently co-authored a Venus-boosting paper in Astrobiology with colleague Louis Irwin. The bias against life on Venus is partly rooted in our own biology. Human experience instructs that liquid water, preferably l

43、ot of it, is essential for life. In search for extraterrestrial life, we obsess over small rivers in Mars surface apparently carved by ancient gushes of water, and delight in hints of permafrost(永久冻结带)just underneath its surface.(By comparison, Venus isnt even that interesting to look at: A boring c

44、ue ball(台球的白色母球)for backyard astronomers, its clouds reflects 75% of visible light.)Attention and then funding follow the water: Three more landers will depart for Mars this spring, and serious plans for sample-return missions hover in the midterm future. “If you have limited resources, you base exp

45、loration on what you know,“ says Arizona State University planetary geologist Ronal Greeley. Its like losing your keys on the way home at night: The first place you look is under the streetlights not because theyre more likely to be there, but because if they are, youll spot them. For astrobiologist

46、s, the streetlights are the spectral(光谱的)lines for water, and theyve spotted that potential on Mars, Jupiters moon Europa, even Neptunes moon Triton. Not on the baking rocky flats of Venus.（分数：10.00）(1).Venus is the hottest of all the nine planets in the solar system because_.（分数：2.00）A.it is not so

47、 close to the sun as MercuryB.many volcanoes spread the whole planetC.it is covered by a thick layer of cloudD.greenhouse effect is uncontrollable on it(2).Some planetologists believed there had never been lives on Venus because_.（分数：2.00）A.they couldnt find any trace of water on itB.they found Venu

48、s is too hot for any livesC.Venus is covered by dirty and poisonous cloudD.Venus is the second nearest planet to the sun(3).It can be inferred from the passage that the small group of advanced life-forms on Earth believed that_.（分数：2.00）A.life could exist in hot environmentB.life could exist without

49、 waterC.there are still lives on VenusD.there used to be lives on Mars(4).What do we learn from the passage about Venus and Mars?（分数：2.00）A.The atmospheric pressure of Venus is stronger than that of Mars.B.Venus attracts more attention and funding than Mars.C.Venus is closer to the sun than Mars.D.Venus looks more beautiful than