雅思阅读模拟试题Word格式.docx

1、 home not only to frogs but to all manner of wildlife. However, as yet, there are no obvious reasons why certain frog species are disappearing from rainforests in Australia that have barely been touched by human hand. The mystery is unsettling to say the least, for it is known that amphibian species

2、 are extremely sensitive to environmental variations in temperature and moisture levels. The danger is that planet Earth might not only lose a vital link in the ecological food chain （frogs keep populations of otherwise pestilent insects at manageable levels）, but we might be increasing our output o

3、f air pollutants to levels that may have already become irreversible. Frogs could be inadvertently warning us of a catastrophe. An example of a species of frog that, at far as is known, has become extinct, is the platypus frog. Like the well-known Australian mammal it was named after, it exhibited s

4、ome very strange behaviour; instead of giving birth to tadpoles in the water, it raised its young within its stomach. The baby frogs were actually born from out of their mothers mouth. Discovered in 1981, less than ten years later the frog had completely vanished from the crystal clear waters of Boo

5、loumba Creek near Queenslands Sunshine Coast. Unfortunately, this freak of nature is not the only frog species to have been lost in Australia. Since the 1970s, no less than eight others have suffered the same fate. One theory that seems to fit the facts concerns the depletion of the ozone layer, a w

6、ell documented phenomenon which has led to a sharp increase in ultraviolet radiation levels.The ozone layer is meant to shield the Earth from UV rays, but increased radiation may be having a GREater effect upon frog populations than previously believed. Another theory is that worldwide temperature i

7、ncreases are upsetting the breeding cycles of frogs. TRUE/FALSE/NOT GIVEN 1.Frogs are disappearing only from city areas. 2.Frogs and toads are usually poisonous. 3.Biologists are unable to explain why frogs are dying. 4.The frogs natural habitat is becoming more and more developed. 5.Attempts are be

8、ing made to halt the development of wet marshland. 6.Frogs are important in the ecosystem because they control pests. 7.The platypus frog became extinct by 1991. 8.Frogs usually give birth to their young in an underwater nest. 9.Eight frog species have become extinct so far in Australia. 10.There is

9、 convincing evidence that the ozone layer is being depleted.11.It is a fact that frogs breeding cycles are upset by worldwide in creases in temperature.Answer Keys：1.F 2.F 3.T 4.T 5.NG 6.T 7.T 8.NG 9.F 10.T 11.F 2014年雅思阅读模拟试题（2）Almost everyone with or without a computer is aware of the latest techno

10、logical revolution destined to change forever the way in which humans communicate, namely, the Information Superhighway, best exemplified by the ubiquitous Internet. Already, millions of people around the world are linked by computer simply by having a modem and an address on the Net, in much the sa

11、me way that owning a telephone links us to almost anyone who pays a phone bill. In fact, since the computer connections are made via the phone line, the Internet can be envisaged as a network of visual telephone links. It remains to seen in which direction the Information Superhighway is headed, but

12、 many believeit is the educational hope of the future. The World Wide Web, an enormous collection of Internet addresses or sites, all of which can be accessed for information, has been mainly responsible for the increase in interest in the Internet in the 1990s. Before the World Wide Web, the Net wa

13、s comparable to an integrated collection of computerized typewriters, but the introduction of the Web in 1990 allowed not only text links to be made but also graphs, images and even video. A Web site consists of a home page, the first screen of a particular site on the computer to which you are conn

14、ected, from where access can be had to other subject related pages（or screens） at the site and on thousands of other computers all over the world. This is achieved by a process called hypertext. By clicking with a mouse device on various parts of the screen, a person connected to the Net can go trav

15、eling, or surfing through a of the screen, a person connected to the Net can go traveling, or surfing through a web of pages to locate whatever information is required. Anyone can set up a site; promoting your club, your institution, your companys products or simply yourself, is what the Web and the

16、 Internet is all about. And what is more, information on the Internet is not owned or controlled by any one organization. It is, perhaps, true to say that no one and therefore everyone owns the Net. BECause of the relative freedom of access to information, the Internet has often been criticised by t

17、he media as a potentially hazardous tool in the hands of young computer users. This perception has proved to be largely false however, and the vast majority of users both young and old get connected with the Internet for the dual purposes for which it was intended - discovery and delight. 1.Everyone

18、 is aware of the Information Superhighway. 2.Using the Internet costs the owner of a telephone extra money. 3.Internet computer connections are made by using telephone lines. 4.The World Wide Web is a network of computerised typewriters. 5.According to the author, the Information Superhighway may be

19、 the future hope of education. 6.The process calledhypertextrequires the use of a mouse device. 7.The Internet was created in the 1990s. 8.The home pageis the first screen of a Website on the Net. 9.The media has often criticised the Internet because it is dangerous. 10. The latest technological rev

20、olution will change the way humans communicate. 1.F 2.NG 3.T 4.F 5.T 6.T 7.F 8.T 9.F 10.T2014年雅思阅读模拟试题（3）1. The failure of a high-profile cholesterol drug has thrown a spotlight on the complicated machinery that regulates cholesterol levels. But many researchers remain confident that drugs to boost

21、levels of good cholesterol are still one of the most promising means to combat spiralling heart disease. 2. Drug company Pfizer announced on 2 December that it was cancelling all clinical trials of torcetrapib， a drug designed to raise heart-protective high-density lipoproteins （HDLs）。 In a trial of

22、 15000 patients， a safety board found that more people died or suffered cardiovascular problems after taking the drug plus a cholesterol-lowering statin than those in a control group who took the statin alone. 3. The news came as a kick in the teeth to many cardiologists because earlier tests in ani

23、mals and people suggested it would lower rates of cardiovascular disease. “There have been no red flags to my knowledge，” says John Chapman， a specialist in lipoproteins and atherosclerosis at the National Institute for Health and Medical Research （INSERM） in Paris who has also studied torcetrapib.

24、“This cancellation came as a complete shock.” 4. Torcetrapib is one of the most advanced of a new breed of drugs designed to raise levels of HDLs， which ferry cholesterol out of artery-clogging plaques to the liver for removal from the body. Specifically， torcetrapib blocks a protein called choleste

25、rol ester transfer protein （CETP）， which normally transfers the cholesterol from high-density lipoproteins to low density， plaque-promoting ones. Statins， in contrast， mainly work by lowering the bad low-density lipoproteins. Under pressure 5. Researchers are now trying to work out why and how the d

26、rug backfired， something that will not become clear until the clinical details are released by Pfizer. One hint lies in evidence from earlier trials that it slightly raises blood pressure in some patients. It was thought that this mild problem would be offset by the heart benefits of the drug. But i

27、t is possible that it actually proved fatal in some patients who already suffered high blood pressure. If blood pressure is the explanation， it would actually be good news for drug developers because it suggests that the problems are specific to this compound. Other prototype drugs that are being de

28、veloped to block CETP work in a slightly different way and might not suffer the same downfall. 6. But it is also possible that the whole idea of blocking CETP is flawed， says Moti Kashyap， who directs atherosclerosis research at the VA Medical Center in Long Beach， California. When HDLs excrete chol

29、esterol in the liver， they actually rely on LDLs for part of this process. So inhibiting CETP， which prevents the transfer of cholesterol from HDL to LDL， might actually cause an abnormal and irreversible accumulation of cholesterol in the body. “Youre blocking a physiologic mechanism to eliminate cholesterol and effectively constipating the pathway，” says Kashyap. Going up 7. Most researchers remain confident that elevating high density lipoproteins levels by one means or another is one of the best routes for helping heart disease pati