剑桥雅思阅读7test1原文翻译及答案.docx

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1、剑桥雅思阅读7test1原文翻译及答案 雅思阅读是块难啃的硬骨头，须要我们做更多的题目才能得心应手。下面我给大家共享一下剑桥雅思阅读7test1原文翻译及答案解析，希望可以帮助到大家。 剑桥雅思阅读7test1原文 READING PASSAGE 1 You should spend about 20 minutes on Questions 1-13, which are based on Reading Passage 1 below. Lets Go Bats A Bats have a problem: how to find their way around in the dark.

2、 They hunt at night, and cannot use light to help them find prey and avoid obstacles. You might say that this is a problem of their own making, one that they could avoid simply by changing their habits and hunting by day. But the daytime economy is already heavily exploited by other creatures such a

3、s birds. Given that there is a living to be made at night, and given that alternative daytime trades are thoroughly occupied, natural selection has favoured bats that make a go of the night-hunting trade. It is probable that the nocturnal trades go way back in the ancestry of all mammals. In the tim

4、e when the dinosaurs dominated the daytime economy, our mammalian ancestors probably only managed to survive at all because they found ways of scraping a living at night. Only after the mysterious mass extinction of the dinosaurs about 65 million years ago were our ancestors able to emerge into the

5、daylight in any substantial numbers. B Bats have an engineering problem: how to find their way and find their prey in the absence of light. Bats are not the only creatures to face this difficulty today. Obviously the night-flying insects that they prey on must find their way about somehow. Deep-sea

6、fish and whales have little or no light by day or by night. Fish and dolphins that live in extremely muddy water cannot see because, although there is light, it is obstructed and scattered by the dirt in the water. Plenty of other modern animals make their living in conditions where seeing is diffic

7、ult or impossible. C Given the questions of how to manoeuvre in the dark, what solutions might an engineer consider? The first one that might occur to him is to manufacture light, to use a lantern or a searchlight. Fireflies and some fish (usually with the help of bacteria) have the power to manufac

8、ture their own light, but the process seems to consume a large amount of energy. Fireflies use their light for attracting mates. This doesnt require a prohibitive amount of energy: a males tiny pinprick of light can be seen by a female from some distance on a dark night, since her eyes are exposed d

9、irectly to the light source itself. However, using light to find ones own way around requires vastly more energy, since the eyes have to detect the tiny fraction of the light that bounces off each part of the scene. The light source must therefore be immensely brighter if it is to be used as a headl

10、ight to illuminate the path, than if it is to be used as a signal to others. In any event, whether or not the reason is the energy expense, it seems to be the case that, with the possible exception of some weird deep-sea fish, no animal apart from man uses manufactured light to find its way about. D

11、 What else might the engineer think of? Well, blind humans sometimes seem to have an uncanny sense of obstacles in their path. It has been given the name facial vision, because blind people have reported that it feels a bit like the sense of touch, on the face. One report tells of a totally blind bo

12、y who could ride his tricycle at good speed round the block near his home, using facial vision. Experiments showed that, in fact, facial vision is nothing to do with touch or the front of the face, although the sensation may be referred to the front of the face, like the referred pain in a phantom l

13、imb. The sensation of facial vision, it turns out, really goes in through the ears. Blind people, without even being aware of the fact, are actually using echoes of their own footsteps and of other sounds, to sense the presence of obstacles. Before this was discovered, engineers had already built in

14、struments to exploit the principle, for example to measure the depth of the sea under a ship. After this technique had been invented, it was only a matter of time before weapons designers adapted it for the detection of submarines. Both sides in the Second World War relied heavily on these devices,

15、under such codenames as Asdic (British) and Sonar (American), as well as Radar (American) or RDF (British), which uses radio echoes rather than sound echoes. E The Sonar and Radar pioneers didnt know it then, but all the world now knows that bats, or rather natural selection working on bats, had per

16、fected the system tens of millions of years earlier, and their radar achieves feats of detection and navigation that would strike an engineer dumb with admiration. It is technically incorrect to talk about bat radar, since they do not use radio waves. It is sonar. But the underlying mathematical the

17、ories of radar and sonar are very similar, and much of our scientific understanding of the details of what bats are doing has come from applying radar theory to them. The American zoologist Donald Griffin, who was largely responsible for the discovery of sonar in bats, coined the term echolocation t

18、o cover both sonar and radar, whether used by animals or by human instruments. Questions 1-5 Reading Passage 1 has five paragraphs, A-E. Which paragraph contains the following information? Write the correct letter, A-E, in boxes 1-5 on your answer sheet. NB You may use any letter more than once. 1 e

19、xamples of wildlife other than bats which do not rely on vision to navigate by 2 how early mammals avoided dying out 3 why bats hunt in the dark 4 how a particular discovery has helped our understanding of bats 5 early military uses of echolocation Questions 6-9 Complete the summary below. Choose ON

20、E WORD ONLY from the passage for each answer. Write your answers in boxes 6-9 on your answer sheet. Facial Vision Blind people report that so-called facial vision is comparable to the sensation of touch on the face. In fact, the sensation is more similar to the way in which pain from a 6arm or leg m

21、ight be felt. The ability actually comes from perceiving 7through the ears. However, even before this was understood, the principle had been applied in the design of instruments which calculated the 8of the seabed. This was followed by a wartime application in devices for finding 9 Questions 10-13 C

22、omplete the sentences below. Choose NO MORE THAN TWO WORDS from the passage for each answer. Write your answers in boxes 10-13 on your answer sheet. 10 Long before the invention of radar, had resulted in a sophisticated radar-like system in bats. 11 Radar is an inaccurate term when referring to bats

23、 because are not used in their navigation system. 12 Radar and sonar are based on similar . 13 The word echolocation was first used by someone working as a . READING PASSAGE 2 You should spend about 20 minutes on Questions 14-26, which are based on Reading Passage 2 on the following pages. Questions

24、 14-20 Reading Passage 2 has seven paragraphs, A-H. Choose the correct heading for paragraphs A and C-H from the list of headings below. Write the correct number, i-xi, in boxes 14-20 on your answer sheet. List of Headings i Scientists call for a revision of policy ii An explanation for reduced wate

25、r use iii How a global challenge was met iv Irrigation systems fall into disuse v Environmental effects vi The financial cost of recent technological improvements vii The relevance to health viii Addressing the concern over increasing populations ix A surprising downward trend in demand for water x

26、The need to raise standards xi A description of ancient water supplies 14 Paragraph A Example Answer Paragraph B iii 15 Paragraph C 16 Paragraph D 17 paragraph E 18 paragraph F 19 paragraph G 20 paragraph H MAKING EVERYDROP COUNT A The history of human civilisation is entwined with the history of th

27、e ways we have learned to manipulate water resources. As towns gradually expanded, water was brought from increasingly remote sources, leading to sophisticated engineering efforts such as dams and aqueducts. At the height of the Roman Empire, nine major systems, with an innovative layout of pipes an

28、d well-built sewers, supplied the occupants of Rome with as much water per person as is provided in many parts of the industrial world today. B During the industrial revolution and population explosion of the 19th and 20th centuries, the demand for water rose dramatically. Unprecedented construction

29、 of tens of thousands of monumental engineering projects designed to control floods, protect clean water supplies, and provide water for irrigation and hydropower brought great benefits to hundreds of millions of people. Food production has kept pace with soaring populations mainly because of the ex

30、pansion of artificial irrigation systems that make possible the growth of 40 % of the worlds food. Nearly one fifth of all the electricity generated worldwide is produced by turbines spun by the power of falling water. C Yet there is a dark side to this picture: despite our progress, half of the wor

31、lds population still suffers, with water services inferior to those available to the ancient Greeks and Romans. As the United Nations report on access to water reiterated in November 2001, more than one billion people lack access to clean drinking water; some two and a half billion do not have adequ

32、ate sanitation services. Preventable water-related diseases kill an estimated 10,000 to 20,000 children every day, and the latest evidence suggests that we are falling behind in efforts to solve these problems. D The consequences of our water policies extend beyond jeopardising human health. Tens of

33、 millions of people have been forced to move from their homes often with little warning or compensation to make way for the reservoirs behind dams. More than 20 % of all freshwater fish species are now threatened or endangered because dams and water withdrawals have destroyed the free-flowing river

34、ecosystems where they thrive. Certain irrigation practices degrade soil quality and reduce agricultural productivity. Groundwater aquifers_are being pumped down faster than they are naturally replenished in parts of India, China, the USA and elsewhere. And disputes over shared water resources have l

35、ed to violence and continue to raise local, national and even international tensions. _underground stores of water E At the outset of the new millennium, however, the way resource planners think about water is beginning to change. The focus is slowly shifting back to the provision of basic human and

36、 environmental needs as top priority ensuring some for all, instead of more for some. Some water experts are now demanding that existing infrastructure be used in smarter ways rather than building new facilities, which is increasingly considered the option of last, not first, resort. This shift in p

37、hilosophy has not been universally accepted, and it comes with strong opposition from some established water organisations. Nevertheless, it may be the only way to address successfully the pressing problems of providing everyone with clean water to drink, adequate water to grow food and a life free

38、from preventable water-related illness. F Fortunately and unexpectedly the demand for water is not rising as rapidly as some predicted. As a result, the pressure to build new water infrastructures has diminished over the past two decades. Although population, industrial output and economic productiv

39、ity have continued to soar in developed nations, the rate at which people withdraw water from aquifers, rivers and lakes has slowed. And in a few parts of the world, demand has actually fallen. G What explains this remarkable turn of events? Two factors: people have figured out how to use water more

40、 efficiently, and communities are rethinking their priorities for water use. Throughout the first three-quarters of the 20th century, the quantity of freshwater consumed per person doubled on average; in the USA, water withdrawals increased tenfold while the population quadrupled. But since 1980, th

41、e amount of water consumed per person has actually decreased, thanks to a range of new technologies that help to conserve water in homes and industry. In 1965, for instance, Japan used approximately 13 million gallons_of water to produce $1 million of commercial output; by 1989 this had dropped to 3

42、.5 million gallons (even accounting for inflation) almost a quadrupling of water productivity. In the USA, water withdrawals have fallen by more than 20 % from their peak in 1980. H On the other hand, dams, aqueducts and other kinds of infrastructure will still have to be built, particularly in deve

43、loping countries where basic human needs have not been met. But such projects must be built to higher specifications and with more accountability to local people and their environment than in the past. And even in regions where new projects seem warranted, we must find ways to meet demands with fewe

44、r resources, respecting ecological criteria and to a smaller budget. Questions 21-26 Do the following statements agree with the information given in Reading Passage 2? In boxes 21-26 on your answer sheet, write YES if the statement agrees with the claims of the writer NO if the statement contradicts

45、 the claims of the writer NOT GIVEN if it is impossible to say what the writer thinks about this 21 Water use per person is higher in the industrial world than it was in Ancient Rome. 22 Feeding increasing populations is possible due primarily to improved irrigation systems. 23 Modern water systems

46、imitate those of the ancient Greeks and Romans. 24 Industrial growth is increasing the overall demand for water. 25 Modern technologies have led to a reduction in domestic water consumption. 26 In the future, governments should maintain ownership of water infrastructures. READING PASSAGE 3 You shoul

47、d spend about 20 minutes on Questions 27-40, which are based on Reading Passage 3 below. EDUCATING PSYCHE Educating Psyche by Bernie Neville is a book which looks at radical new approaches to learning, describing the effects of emotion, imagination and the unconscious on learning. One theory discussed in the book is that proposed by George Lozanov, which focuses on the power of suggestion. Lozanovs instructiona