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雅思阅读专项练习(13)

2018-07-27 11:54:00来源:网络 柯林斯词典

  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 cholesterol 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."You're 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 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 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 know 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 1-7

  This passage has 7 paragraphs 1-7.

  Choose the correct heading for each paragraph from the list of headings below.

  Write the correct number i-ix in boxes 1-7 on your answer sheet.

  List of Headings

  i. How does torcetrapib work?

  ii. Contradictory result prior to the current trial

  iii. One failure may possibly bring about future success

  iv. The failure doesn’t lead to total loss of confidence

  v. It is the right route to follow

  vi. Why it’s stopped

  vii. They may combine and theoretically produce ideal result

  viii. What’s wrong with the drug

  ix. It might be wrong at the first place

  Example answer

  Paragraph 1 iv

  1. Paragraph 2

  2. Paragraph 3

  3. Paragraph 4

  4. Paragraph 5

  5. Paragraph 6

  6. Paragraph 7

  Questions 7-13

  Match 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.

  7.It has been administered to over 10,000 subjects in a clinical trial.

  8.It could help rid human body of cholesterol.

  9.Researchers 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 it’s blocked.

  12. It produced contradictory results in different trials.

  13. It could inhibit LDLs.

  List of choices

  A. Torcetrapic

  B. HDLS

  C. Statin

  D. CETP


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