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1、精品文档，仅供学习与交流，如有侵权请联系网站删除雅思英语阅读练习题及答案：第一篇内容摘要： The failure of a high-profile cholesterol drug has thrown a spotlight on the complicated machinery that regulates cholesterol levels.Why did a promising heart drug fail?Doomed drug highlights complications of meddling with cholesterol.1. The failure of a
2、 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 levels of good cholesterol are still one of the most promising means to combat spiralling heart disease.2. Drug company Pfiz
3、er 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 15000 patients, a safety board found that more people died or suffered cardiovascular problems after taking the drug plus a
4、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 animals and people suggested it would lower rates of cardiovascular disease. There have been no red flags to my knowledge, says J
5、ohn Chapman, a specialist in lipoproteins and atherosclerosis at the National Institute for Health and Medical Research (INSERM) in Paris who has also studied torcetrapib. This cancellation came as a complete shock.4. Torcetrapib is one of the most advanced of a new breed of drugs designed to raise
6、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 cholesterol ester transfer protein (CETP), which normally transfers the cholesterol from high-density lipoproteins to low density, plaque-p
7、romoting ones. Statins, in contrast, mainly work by lowering the bad low-density lipoproteins.Under pressure5. Researchers are now trying to work out why and how the drug backfired, something that will not become clear until the clinical details are released by Pfizer. One hint lies in evidence from
8、 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 it is possible that it actually proved fatal in some patients who already suffered high blood pressure. If blood pressure is the expla
9、nation, 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 developed to block CETP work in a slightly different way and might not suffer the same downfall.6. But it is also possible that the who
10、le 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 cholesterol in the liver, they actually rely on LDLs for part of this process. So inhibiting CETP, which prevents the transfer of choleste
11、rol 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 up7. Most researchers remain confident that elevating high dens
12、ity lipoproteins levels by one means or another is one of the best routes for helping heart disease patients. But HDLs are complex and not entirely understood. One approved drug, called niacin, is known to both raise HDL and reduce cardiovascular risk but also causes an unpleasant sensation of heat
13、and tingling. Researchers are exploring whether they can bypass this side effect and whether niacin can lower disease risk more than statins alone. Scientists are also working on several other means to bump up high-density lipoproteins by, for example, introducing synthetic HDLs. The only thing we k
14、now is dead in the water is torcetrapib, not the whole idea of raising HDL, says Michael Miller, director of preventive cardiology at the University of Maryland Medical Center, Baltimore.(613 words nature)Questions 1-7This passage has 7 paragraphs 1-7.Choose the correct heading for each paragraph fr
15、om the list of headings below.Write the correct number i-ix in boxes 1-7 on your answer sheet.List of Headingsi. How does torcetrapib work?ii. Contradictory result prior to the current trialiii. One failure may possibly bring about future successiv. The failure doesnt lead to total loss of confidenc
16、ev. It is the right route to followvi. Why its stoppedvii. They may combine and theoretically produce ideal resultviii. Whats wrong with the drugix. It might be wrong at the first placeExample answerParagraph 1 iv1 Paragraph 2vi2 Paragraph 3ii3 Paragraph 4vii4 Paragraph 5ix5 Paragraph 6viii6 Paragra
17、ph 7ivQuestions 7-13Match torcetrapib，HDLs，statin and CETP with their functions （Questions 8-13）.Write the correct letter A, B, C or D in boxes 8-13 on your answer sheet.NB You may use any letter more than once.7It has been administered to over 10,000 subjects in a clinical trial.8It could help rid
18、human body of cholesterol.9Researchers are yet to find more about it. 10. It was used to reduce the level of cholesterol.11. According to Kashyap, it might lead to unwanted result if its blocked.12. It produced contradictory results in different trials.13. It could inhibit LDLs.List of choicesA. Tor
19、cetrapicB. HDLSC. StatinD. CETP(by Zhou Hong)Suggested Answers and Explanations1 vi 2 ii3 vii 本段介绍了torcetrapib和statin的治病原理，但是同时短语“in contrast”与之前第二段后半段的内容呼应，暗示了这两种药在理论上能相辅相成，是理想的搭配。第一个选项无法涵盖整段意义，故选择i是错误的。4 iii 本段分析了可能导致torcetrapibl临床试验失败的原因，后半段指出如果以上推测正确，那么未来的药物可借鉴这个试验，设法避免torcetrapib的缺陷，研制出有效的药物。vi
20、ii选项无法涵盖后半段的意思。5 ix 见首句。6 v 7 A 见第二段。题目中administer一词意为“用药”，subject一词为“实验对象”之意。8 B 见第四段“ to raise levels of HDLs, which ferry cholesterol out of artery-clogging plaques to the liver for removal from the body.”即HDLs的作用最终是将choleserol清除出人体：“ for removal from the body”。9 B 见第四段“But HDLs are complex and n
21、ot entirely understood.”10C 见第二段“ plus a cholesterol-lowering statin”，即statin是可以降低cholesterol的。11 D 见第六段“So inhibiting CETP, might actually cause an abnormal and irreversible accumulation of cholesterol in the body. 12 A 见第三段。13 C 见第四段“Statins, in contrast, mainly work by lowering the bad low-density lipoproteins.”【精品文档】第 3 页