单项选择题

The author implies that alcohol ______.

A．can be dangerous
B．can make a drug useless
C．can cause a person turn to drugs
D．can intensify the effects of a drug
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单项选择题
What are side effects according to the passage
A．Withdrawal symptoms.
B．Overdoses.
C．Certain effects other than intended ones.
D．Sidewalk effects.
单项选择题
The author advises parents ______.
A．to take medicines before children
B．to avoid taking drags in front of children
C．to throw away old medicines
D．to teach children about medicines
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