大学英语六级分类模拟题451及答案解析.doc

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1、大学英语六级分类模拟题 451及答案解析(总分：446.00，做题时间：90 分钟)一、Reading Comprehensio(总题数：0，分数：0.00)二、Section A(总题数：1，分数：71.00)The Health Benefits of Drinking WaterIs Bottled Drinking Water Healthier Than Filtered Tap Water? A Water is a key ingredient in a healthy diet and lifestyle. There are many health benefits of d

2、rinking water. It helps flush impurities and toxins out of our systems. It aids in the delivery of oxygen and nutrients. In fact, nearly every system in our bodies relies on water for proper functioning. But what will happen if the water you drink is unhealthy? B In past decades, concerns about tap

3、water and its impact on overall health led some people to turn to bottled drinking water instead. However, in those days, there were few choices of bottled waters. You could pay to have a company deliver large bulky plastic bottles of water for the water cooler. Or you could purchase gallon jugs of

4、distilled or “drinking water“ at the grocery store. C In recent years, there has been an explosion in the number of different bottled waters available, with big distributors such as Coke and Pepsi jumping on the bandwagon. But are bottled drinking waters like Coke“s Dasani brand, Pepsi“s Aquafina, o

5、r Wal-Mart“s store brand really any healthier than your tap water? Or would you be better off with a drinking water filtration system? D As we have learned more about the water we drink, the technology behind drinking water filters and purification systems has improved dramatically. There are filter

6、s to remove impurities, chemicals, heavy metals, bacteria and most every contaminant you can think of. With the right size and filter combination for your specific home, your water can be exceptionally pure and healthy. Cost Comparison E Drinking water filtration systems have also become more afford

7、able and easy to use. Although the initial cost of a whole house system usually amounts to several hundred dollars, that cost is often less than $100 each year if spread out over the life of the system. There may be additional expenses to replace carbon filters, membranes in reverse osmosis drinking

8、 water filtration system, or lamps in an ultraviolet light water treatment device. These expenses can add another $100 or so to the annual costs of operating drinking water filters and purification systems. F While some people may hesitate to spend so much each year for clean, safe drinking water, t

9、hey are probably paying more for bottled drinking water. Calculations show that at a price of $1 to $4 per gallon, bottled or delivered water costs an average of $400 each year, especially if you purchase individual bottles. And that doesn“t take into consideration the gas needed to drive to the sto

10、re or the environmental impact of all the empty plastic bottles. Health Aspects G Many people who choose bottled drinking water understand that it is more expensive, but they are still willing to pay the extra money because bottled water is thought to be safer and healthier than filtered drinking wa

11、ter. After all, bottled water is often marketed as “natural spring water“ or “pure glacier water.“ H In reality, few bottled waters come from natural springs, and most of them use municipal tap water. The companies are able to get away with this false marketing because the regulations and standards

12、for bottle drinking water are less stringent than those for residential drinking sources. I The quality of bottled water is regulated by the Food and Drug Administration (FDA), while drinking water systems are typically regulated by State regulations or the Environmental Protection Agency (EPA). Thi

13、s doesn“t mean that the FDA isn“t doing their job. It“s just that the rules for bottled water only require it to be as good as tap water, not better. J In addition, the FDA regulations only apply to bottled drinking water that is transported across state lines. If a company sells their bottled drink

14、ing water in the same state where it was bottled, the federal regulations don“t apply. The result is that many bottled waters are not any healthier than filtered water, and in fact some are less pure. K This was demonstrated in a study which was conducted in 1999 by the Natural Resources Defense Cou

15、ncil. They tested over 100 brands of bottled drinking water and found that about one third of the waters contained contamination in the form of chemicals, bacteria, and arsenic. The study also found that up to forty percent of bottled drinking waters come from a city water system. How to Tell if You

16、r Water Is Healthy L So how do you tell if the water you are drinking is healthy? With tap water, it is relatively easy. If you water comes from a municipal source, the suppliers are required by law to provide annual water quality reports. If you have a well, you can have an authorized lab test your

17、 water. It may cost $100 or more, but it“s a small price to pay for peace of mind. Or you can purchase a kit and test it your-self, but naturally the results may not be as conclusive or reliable as those produced by authorized labs. M When it comes to bottled drinking water, it can be more difficult

18、 to know what you are getting. Start by checking the label or the bottle cap. Some may tell you that the water comes from a municipal source or “community water system“, which means tap water. N If the label doesn“t give any information, you can call the bottler and ask. But don“t be surprised if yo

19、u get the run around and are transferred to several different departments. Some states have a bottled water program that tracks bottled drinking water and can tell you the origin of the source water as well as other information. O Safe and healthy drinking water has become big business. Thousands of

20、 companies are vying for your hard earned cash, and some are not always honest about what their products offer. The initial investment for a home drinking water filtration system can seem expensive at first, but over time, it is usually less expensive than bottled drinking water. And with a water fi

21、lter, you at least know where the water you drink came from and how it was treated. P Before going out and spending your hard earned money for bottled drinking water that may, be no better than your own tap water, it is obviously a good idea to do some research. You are likely to decide that a drink

22、ing water filtration system and/or purifier is the healthier choice and provides the best value as well.（分数：71.00）(1).In the past decades, bottled drinking water was restricted to few choices.（分数：7.10）(2).Generally, the companies that use municipal tap water as bottled water can escape punishment by

23、 law.（分数：7.10）(3).Now, tap water can also become exceptionally pure and healthy if a right filtration system is installed in your home.（分数：7.10）(4).Operating drinking water filters and purification systems costs about two hundred dollars every year.（分数：7.10）(5).One of the disadvantages of bottled wa

24、ter is that the plastic bottles would bring about impact on the environment.（分数：7.10）(6).The Environmental Protection Agency is responsible for supervising the quality of drinking water.（分数：7.10）(7).When the bottled water is claimed to come from a “community water system“, it is actually tap water.（

25、分数：7.10）(8).If you need to know any information about the bottled water, you can either ask the bottler for it or get it from the state“s bottled water program.（分数：7.10）(9).In a study by The Natural Resources Defense Council, many bottled drinking water was found not to be as healthy as expected.（分数

26、：7.10）(10).It is required that the quality of tap water by a municipal source be provided by its supplier in the annual water quality reports.（分数：7.10）三、Section B(总题数：0，分数：0.00)四、Passage One(总题数：3，分数：213.00)While it can“t yet be said that every mouthful of food has been changed through genetic engin

27、eering, it is likely that almost every American has had a mouthful of engineered food. Take the soybean, for example. About 55 percent of last year“s crop was genetically engineered in some fashion, reports the American Soybean Association. And though few Americans sit down to a plate of soybeans fo

28、r dinner, these soybeans arrive through the back door as an additive to scores of foods like cooking oils, salad dressings, coffee creamers, beer, cereals and candy. America is on the verge of a second green revolution. The first tripled world food output over the course of a mere three decades duri

29、ng the late 20th century. Scientists boosted crop yields by crossbreeding (杂交) related plants that add desirable traits. Then farmers added fertilizer, pesticide, and irrigation in order to make the high-yield crops thrive. Now that those gains are leveling off, scientists are looking to biotechnolo

30、gy to increase food production even more. This time, instead of breeding plants with their closest relatives, scientists are inserting genes. For example, genes from flounders can help ordinary plants like tomatoes and strawberries fight the cold. Researchers are also inserting bacterial genes into

31、corn and soybean plants to better protect them from insects or render them immune to certain herbicides The technology has enormous potential. The application of biotechnology is going to produce a set of possibilities that we simply cannot conceive of, even in our most imaginative flights of fancy.

32、 For farmers, crops engineered with genes that resist cold, drought, or other adverse weather conditions can boost crop yields with less money and effort. For consumers, that could mean cheaper food. Such crops would also help feed and better nourish people in developing nations, such as drought-rid

33、den Africa. But as these crops begin infiltrating (渗透) our food supply, environmental and consumer groups have begun to question whether potential risks to the environment and human health have been adequately studied. Last year, for example, biologists for the first time found evidence suggesting t

34、hat planting genetically modified corn in open fields may kill butterflies who feed on the corn“s pollen. Scientists are also questioning whether foods with a gene inserted to improve one area of their performance could prove detrimental in another: For one thing, the genes might cause allergic reac

35、tions in people who never had a reaction to that food before.（分数：71.00）(1).The example of the soybean the author takes is to prove that _.（分数：14.20）A.Americans are fond of soybeansB.every mouthful of soybean has been changed by genetic engineeringC.America is on the verge of a second green revolutio

36、nD.soybean is treated as an additive to scores of foods(2).What is the main purpose of the first green revolution in America?（分数：14.20）A.To crossbreed the related plants.B.To add the desirable traits to the plants.C.To realize the green revolution in three decades.D.To make the high-yield crops thri

37、ve.(3).What“s the biggest difference between the first and second green revolution in America?（分数：14.20）A.The first green revolution is to improve the food output while the second is not.B.The second green revolution is based on the theory of inserting genes while the first depends on that of crossb

38、reeding.C.The technology that is used in the second green revolution has much more enormous potential than that of the first“s.D.The second green revolution has caused harm to the environment while the first has not.(4).What“s the main idea of the last paragraph?（分数：14.20）A.Crops begin infiltrating

39、our food supply.B.The application of biotechnology will cause social questions as well as bring benefits to human beings.C.The application of biotechnology is also questioned by some other people.D.The application of biotechnology will bring enormous business to America.(5).The best title for this p

40、assage might be _.（分数：14.20）A.BiotechnologyAnother Green RevolutionB.BiotechnologyHope and ConcernsC.Soybeanthe Future Dinner Food for AmericansD.Scientific Research in AgricultureBritain“s universities are in an awful spin. Top universities were overwhelmed by the 24% of A-level applicants with ind

41、istinguishable straight A“s; newer ones are beating the byways for bodies. Curiously, both images of educationthe weeping willows of Cambridge and the futuristic architecture of UEL (University of East London)are cherished by the government. Ministers want to see half of all young people in universi

42、ties by 2010 (numbers have stalled at 42%), without letting go of the world-class quality of its top institutions. Many argue that the two goals are incompatible without spending a lot more money. Researchers scrabble (寻找) for funds, and students complain of large classes and reduced teaching time.

43、To help solve the problem, the government agreed in 2004 to let universities increase tuition fees. Though low, the fees have introduced a market into higher education. Universities can offer cut-price tuition, although most have stuck close to the 3,000. Other incentives are more popular. Newcomers

44、 to St. Mark then computers will be easier for people to operate, and the computers will become “people literate“.（分数：20.00）(1).What does “computer-literate“ (Line 4, Para.1) mean?（分数：4.00）A.Everyone is necessary to have a computer.B.People know much knowledge about computers.C.Knowledge about compu

45、ters is hard to absorb.D.Computers are becoming more and more widely used.(2).Why did David Tebbutt oppose the idea of “computer-literate“?（分数：4.00）A.Because “computer-literate“ can hardly bring people closer to the computer.B.Because “computer-literate“ can bring people further to the computer.C.Be

46、cause he believed Computertown can bring people much closer to computer.D.Because he believed that making computer “people-literate“ is more significant.(3).The phrase “cater for“ (Line 4, Para.4) can be replaced by _.（分数：4.00）A.excludeB.accord withC.run byD.opposed by(4).Which of the following is n

47、ot the difference between computertown and computer club?（分数：4.00）A.There are computer fans with some computer knowledge in the club.B.There are experts in computertowns available to answer any questions.C.The computertown develops faster than computer club.D.The computer club may develop into an ex

48、pert computer group.(5).The best title of the passage may be _.（分数：4.00）A.The Development of ComputertownsB.People are Becoming “Computer-literate“C.The Computers are Becoming “People Literate“D.The Relationship Between People and ComputerSpace exploration has always been the province of dreamers: T

49、he human imagination readily soars where human ingenuity (创造力) struggles to follow. A Voyage to the Moon, often cited as the first science fiction story, was written by Cyrano de Bergerac in 1649. Cyrano was dead and buried for a good three centuries before the first manned rockets started to fly. In 1961, when President Kennedy declared that America would send a man to the moon by the decade“s end, those words, too, had a dreamlike quality. They resonated (共鸣) with optimism and ambition in much the same way as the most famous dream sp