六级练习2012.06.22 people, particular, person, particular, lead, people, person, lead

Rebecca949

When a particular drug is taken by millions, some people may not respond in a predictable way, even though the drug has been tested.
A patient may also acquire a tolerance for a certain drug, which means the patient has to (1)______________________. Tolerance may lead to habituation, in which the person becomes so dependent on the drug that he or she becomes addicted to it. (2)_________________________when the drug is taken away. Finally, drugs often have unwanted side effects. This usually causes only minor discomfort, (3)____________________. Certain drugs, however, can produce serious adverse reactions.

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lkl123

danan

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susan.sui

1. take very large doesages to produce side effect
2. addiction causes severe spylogical and physical *
3. such as skin rush, headache or sleepless