单项选择题

Drugs mentioned by the author include ______.

A．heroin, cocaine
B．alcohol, cigarettes
C．chewing tobacco
D．all of the above
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单项选择题
The author's attitude toward drugs is that ______.
A．we should net pay too much money for it
B．we should keep away from drugs
C．the effect of drugs depends on how much we take it
D．second-hand smoking is as much harmful
单项选择题
Which of the following is NOT true
A．Smoking and drinking are as harmful as heroine or cocaine.
B．Chewing tobacco is no less harmful than smoking cigarettes.
C．People who criticize the smoking ones never smoke.
D．Some athletes break rules by using drugs.
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