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rom drugs called side effects, even though they take the drug exactly as directed. The human population contains a great variety of genetic variation（基因变异）, but drugs are tested on just a few thousand people. When a particular drug is taken by millions, some people may not respond in a predictable way, even though the drug has been tested. （20）A patient may also acquire a tolerance（耐药性） for a certain drug, which means the patient has to take ever larger doses（剂量） to produce the desired effect. Tolerance may lead to habituation, in which the person becomes so dependent on the drug that he or she becomes addicted to （上瘾）it. Addiction causes severe psychological and physical disturbances when the drug is taken away. Finally, drugs often have unwanted side effects. These usually cause only minor discomfort, such as a skin rash, headache or sleepiness. Certain drugs, however, can produce serious adverse （不利的，有害的）reactions.
18. Under what circumstances are drugs approved?
A) If they don't involve any risks.
B) If they produce predictable side effects.
C) When the urgent need for them arises.
D) When tests show that they are relatively safe.
19. Why do many people suffer side effects from a drug even though they take it as directed?
A) Because they are not accustomed to it.
B) Because they are not psychologically prepared for it.
C) Because their genes differ from those who have been tested for it.
D) Because they are less sensitive to it than those who have been tested for it.
20. What will happen when patients acquire a tolerance for a certain drug?
A) They will have to take ever larger doses.
B) They will become physically impaired.
C) They will suffer from minor discomfort.
D) They will experience a very painful process.
Part II Reading Comprehension
Passage One
I had an experience some years ago which taught me something about the ways in which people make a bad situation worse by blaming themselves. （21）,（22）One January, I had to officiate at two funerals on successive days for two elderly women in my community. Both （Both指two elderly women ）had died "full of years," as the Bible would say; both yielded to the normal wearing out of the body after a long and full li 上一页 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] ... 下一页 >> |
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