2016年下半年英语六级考试专项模考试卷二_第3页

　　Part IV Reading Comprehension (Reading in Depth) (25 minutes)

　　Section A

　　Questions 47 to 51 are based on the following passage.

　　Wild ducks and other migratory(迁移的) cet6w.com important carriers of deadly bird flu, researchers say. Even so, the infectious-disease experts say there is no solid basis for killing wild birds to protect poultry and minimize the risk of human infection.

　　The European team investigating the global spread of the H5N1 strain of avian influenza(禽流感)says certain duck species may be infecting wild bird populations. Geese and wading birds are also possible vectors(带菌者)of the virus, the team says.

　　The team's study was led by Björn Olsen of Umea University in Sweden. Olsen runs Europe's largest wild-bird flu monitoring program.

　　Studies have shown that influenza viruses in lake water, generally passed via bird feces(粪), can stay infectious for up to 30 days. The migration or feeding behavior of dabbling ducks could at least partially explain the spread of the H5N1 strain of bird flu, the researchers add.

　　This group of duck species includes mallards, teal, pintails, and others that feed at or near the surface, where viruses in cet6w.com likely to be picked up. Perhaps as a result, dabblers have the highest known rates of avian influenza infection, the study says. For instance, nearly 13 percent of mallards tested positive for bird flu. Other species tested include the American black duck (18.1 percent), blue-winged teal (11.5 percent), and northern pintail (11.2 percent).

　　However, bird flu viruses appear to exist in ducks in a low-pathogenic form, meaning infection doesn't usually lead to severe illness and death.

　　"Dabbling ducks are for sure the prime hosts for low pathogenic viruses," said study co-author Ron Fouchier, a virologist at the Erasmus Medical Center in Rotterdam, Netherlands. "But the big question is, how much of our knowledge about these viruses can we translate to high-pathogenic viruses such as the H5N1 strain of bird flu?"

　　In poultry avian viruses can mutate(变异)into more virulent influenza strains, including H5N1. If this mutated virus then finds its way back into wild populations, the birds could then spread the disease through migration.

　　Some scientists have argued that wild cet6w.com with HN51 would be too ill to migrate. Swans, for instance, appear to be particularly vulnerable to the strain. "Swans apparently drop dead quite easily, but they are unlikely to be the vector because they are not going to fly very far if they are dead," Fouchier said.

　　But the study team says that some birds that have been purposely infected for the sake of research show that wild birds can survive H5N1. "For some reason H5N1 has adapted so it no longer kills dabbling ducks," Fouchier said. This means the ducks may be able to spread the virus over a wide area.

　　The study team says migratory geese may also be vectors, because they often graze in huge flocks, a practice that could encourage transmission.

　　Migrating ducks, the researchers add, "could provide an intercontinental bridge" for bird flu to North America, which has not yet had any known cases of H5N1.

　　47. According to the author, what may be the possible carriers of bird flu?

　　48. The main sources of influenza viruses in lake water are ________, which may stay infectious for up to 30 days.

　　49. By saying "bird flu viruses appear to exist in ducks in a low-pathogenic form" (Para. 6), the author suggests that infection ________.

　　50. On what condition can the birds spread the influenza through migration?

　　51. According to the study team, ________ is a practice that can encourage transmission of the bird flu.

　　Section B

　　Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked [A], [B], [C] and [D]. You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the center.

　　Passage One

　　Questions 52 to 56 are based on the following passage.

　　For about three centuries we have been doing science, trying science out, using science for the construction of what we call modern civilization. Every dispensable item of contemporary technology, from canal locks to dial telephones to penicillin, was pieced together from the analysis of data provided by one or another series of scientific experiments. Three hundred years seems a long time for testing a new approach to human inter-living, long enough to set back for critical appraisal of the scientific method, maybe even long enough to vote on whether to go on with it or not. There is an argument.

　　Voices have been raised in protest since the beginning, rising in pitch and violence in the nineteenth century during the early stages of the industrial revolution, summoning urgent crowds into the streets on the issue of nuclear energy. "Give it back," say some of the voices, "It doesn't really work, we've tried it and it doesn't work. Go back three hundred years and start again on something else less chancy for the race of man."

　　The principle discoveries in this century, taking all in all, are the glimpses of the depth of our ignorance of nature. Things that used to seem clear and rational, and matters of absolute certainty-Newtonian mechanics, for example-have slipped through our fingers; and we are left with a new set of gigantic puzzles, cosmic uncertainties, and ambiguities. Some of the laws of physics are amended every few years; some are canceled outright; some undergo revised versions of legislative intent as if they were acts of Congress.

　　Just thirty years ago we call it a biological revolution when the fantastic geometry of the DNA molecule was exposed to public view and the linear language of genetics was decoded. For a while, things seemed simple and clear: the cell was a neat little machine, a mechanical device ready for taking to pieces and reassembling, like a tiny watch. But just in the last few years it has become almost unbelievably complex, filled with strange parts whose functions are beyond today's imagining.

　　It is not just that there is more to do, there is everything to do. What lies ahead, or what can lie ahead if the efforts in basic research are continued, is much more than the conquest of human disease or the improvement of agricultural technology or the cultivation of nutrients in the sea. As we learn more about fundamental processes of living things in general we will learn more about ourselves.

　　52. What CANNOT be inferred from the first paragraph?

　　[A] Scientific experiments in the past three hundred years have produced many valuable items.

　　[B] For three hundred years there have been people holding a hostile attitude toward science.

　　[C] Modern civilization depends on science so man supports scientific progress unanimously.

　　[D] Some people think three hundred years is not long enough to set back for critical appraisal of scientific method.

　　53. The principle discovery in this century shows ________.

　　[A] man has overthrown Newton's laws of physics

　　[B] man has solved a new set of gigantic puzzles

　　[C] man has lost many scientific discoveries

　　[D] man has given up some of the once accepted theories

　　54. Now scientists have found in the past few years ________.

　　[A] the exposure of DNA to the public is unnecessary

　　[B] the tiny cell in DNA is a neat little machine

　　[C] man knows nothing about DNA

　　[D] man has much to learn about DNA

　　55. The writer's main purpose in writing the passage is to say that ________.

　　[A] science is just at its beginning

　　[B] science has greatly improved man's life

　　[C] science has made profound progress

　　[D] science has done too little to human beings

　　56. The writer's attitude towards science is ________.

　　[A] critical [B] approving [C] neutral [D] regretful

　　Passage Two

　　Questions 57 to 61 are based on the following passage.

　　Here amid the steel and concrete canyons, green grass grows. A hawthorn tree(山楂树) stands in new soil, and freshly dug plants bend in the wind.

　　But Chicago City Hall here seems an unlikely spot for a garden of any variety—especially 20,000 square feet of gardens—on its roof.

　　As one of a handful of similar projects around the country, the garden is part of a $1.5 million demonstration projected by the city to reduce its "urban heat islands", said William Abolt, the commissioner of the Department of Environment.

　　Heat islands-dark surfaces in the city, like rooftops-soak up heat. The retention can bake a building, making it stubborn to cooling.

　　The roof of City Hall, a 90-year-old gray stone landmark on LaSalle Street in the heart of downtown, has been known to reach temperature substantially hotter than the actual temperature on the street below.

　　The garden will provide greenery and shade. "And that," said the city officials, "will save the city dollars on those blistering summer days." The project savings from cooling is about $4,000 a year on a new roof whose life span is about 50 percent longer than that of a traditional roof.

　　The sprawling open-air rooftop garden is being carefully built on a multi-tiered bed of special soil, polystyrene, egg-carton-shaped cones and "waterproof membrane" mall to keep the roof from leaking, or caving under the normal combined weight of soil, rain and plant life.

　　The design calls for soil depths of 4 inches to 18 inches. When the last plants and seedlings are buried and the last bit of compost is laid, the garden will have circular brick stepping-stones winding up to hills.

　　"The primary focus of what we want to do was to establish this laboratory on the top of City Hall to get people involved and understanding their impact on the environment and how the little things can make an impact on the quality of life", Mr. Abolt said, adding that the plants also help to clear the air.

　　Rooftop gardens, in places where concrete jungles have erased plants and trees, are not new, not even in Chicago. Arms of greenery dangling over terraces or sprouting from rooftops, common in Europe, are becoming more so in the United States as people become increasingly conscious about the environment.

　　Richard M. Daley, who urged the environmental department to look into the project after noticing rooftop gardens in Hamburg, Germany a few years ago, has praised the garden as the first of its kind on a public building in the country.

　　It will hold thousands of plants in more than 150 species-wild onion and butterfly weed, sky-blue aster and buffalo grass-to provide data on what species adapt best. Small plants requiring shallow soil depths were chiefly selected.

　　57. The rooftop garden project ________.

　　[A] is common and popular in the country

　　[B] is a demonstration project and costs the city government 1.5 million dollars

　　[C] will make the ordinary cooling down of the city in summer unnecessary

　　[D] aims at getting people involved and understanding their impact on the environment

　　58. What can we learn about the City Hall?

　　[A] It was built ninety years ago and is the most outstanding feature in the center of the city.

　　[B] It is originally proper to build a garden on the top of the City Hall.

　　[C] The temperature on its top is a little bit lower than that on the street below.

　　[D] It is the first building in America to have a garden on it.

　　59. Which of the following statements is TRUE?

　　[A] Every year, Chicago spends about $ 4,000 on cooling the city.

　　[B] The design of the garden on the City Hall specially takes into consideration the weight the roof can stand.

　　[C] The Mayor urged the environmental department to look into rooftop gardens in Hamburg and build similar ones in America.

　　[D] Heat islands mainly refer to those dark-colored rooftops which receive and retain heat and will not easily release the heat.

　　60. Why should the rooftop garden be built on the top of City Hall other than on any other buildings?

　　[A] Because the City Hall is large.

　　[B] Because the mayor had urged the environmental department to do so.

　　[C] Because it can make people understand their impact on environment better through a public building.

　　[D] Because the experts just want to make the City Hall a convenient laboratory.

　　61. The word "substantially" (Line 2, Para. 5) most likely means ________.

　　[A] a little bit [B] in fact [C] materially [D] considerably

　　Part IV Reading Comprehension(Reading in Depth)

　　Section A

　　47. Wild ducks and other migratory birds. /Ducks，geese and wading birds.

　　文章开头指出，野鸭以及其他迁徙鸟类可能是致命性禽流感的重要携带者，由此可得答案;第二段又提到，鸭子可能在传染野鸟，而鹅和涉水鸟也可能是病毒的携带者，由此也可得答案。

　　48. bird feces

　　根据题干中的关键词lake water和30 days定位到第四段，可知研究表明，湖水中的流感病毒一般是通过鸟粪传播的，这些病毒的传染性可长达30天。

　　49. doesn’t usually lead to severe illness and death

　　定位到第六段可知，作者提到bird flu viruses appear to exist in ducks in a low-pathogenic form是想表明，传染通常不会导致严重的疾病和死亡。

　　50. The mutated virus finds its way back into wild populations.

　　根据题干中的关键词spread和through migration定位到倒数第五段，可知在家禽体内，禽病毒可能变异为像H5N1一样毒性更强的流感病毒，如果此类变异病毒被野鸟感染，这些鸟就会通过迁徙传播流感。

　　51. grazing in huge flocks

　　根据题干中的关键词study team和encourage transmission定位到倒数第二段，可知研究组表示，迁徙的鹅可能也是病毒携带者，因为它们经常聚在一起吃草，而这可能会促使病毒的传播。

　　Section B

　　Passage One

　　52. C 细节题。由文章第一段最后一句There is an argument可知，人们对科学的看法是有争议的，选项C意思与其相反，故选c。D项干扰性大，对应第一段倒数第二句，表面上看与文章表述意思相反，但文章接下来说There is an argument，由此可知，有的人赞成倒数第二句的观点，有的人反对(即D项的观点)，故排除D。

　　53. D 推断题。由文章第三段最后一句可知，人类对已有理论所采取的做法是修正或摈弃，所以D正确。A、B对应第三段第二句，曲解了文章原意，C文中并未提及，均应排除。

　　54. D 推断题。由文章第四段可知，30年前人们将DNA的发现称为生物革命，刚开始时，人们认为DNA细胞很简单，但随着时间的推移，人们发现它其实极为复杂，由此推断，人们还需要进一步研究，所以D正确。

　　55. A 主旨题。由最后一段尤其是第一句中的there is everything to do可以看出，作者认为关于科学还有很多方面有待于进一步研究、探索，即科学仍处于起步阶段，前面的路还很长很长，所以A正确。

　　56. C 观点态度题。通读全文可知，作者以客观的态度说明了科学的发展状况，并介绍了对待科学的不同观点，综合而言，作者对科学的态度是C(中立的)。A(批评的)，B(赞成的，满意的)，D(遗憾的)均不正确。

　　Passage Two

　　57. D 细节题。文章第三段第一句指出，该工程是全国为数不多的此类工程之一，所以排除A;还说它是政府投资l50万美元的示范工程的一部分，而不是全部，故排除B;文章第四段提到屋顶花园可以降温，但并没有否定传统降温方式的必要性，故排除C;由文章第九段阿伯特先生所说的话可知，D正确。

　　58. A 细节题。由文章第五段可知，市政厅的屋顶有90年的历史，即市政厅建于90年前，且是市中心最著名的建筑，所以A正确。第二段第一句中的an unlikely spot否定了B项中的originally proper。根据第五段可排除C，根据第十段not new可排除D。

　　59. B 推断题。由文章第七段可知，市政厅屋顶花园是精心建造而成的，可以避免屋顶渗漏，或是在土、雨和植物相混合的重量之下坍塌，由此可知，屋顶花园的设计充分考虑到了屋顶能承受的重量，所以B正确。

　　60. C 细节题。由文章第九段可知，在市政厅大楼上修建屋顶花园主要是为了让人们了解自己对环境的影响，所以C正确。虽然该段也提到了laboratory，但指的是让人们了解自己对环境的影响的“实验室”，而并不是真正做实验的实验室，故排除D。

　　61. D 语义题。被考查词在句中用于修饰比较级hotter，分析句意可知，此处应表示强调，突出屋顶的温度要比街上的温度高出很多，选项中只有D(相当大地)最符合。A(一点)，B(实际上)，C(本质上地)均应排除。