单项选择题

According to the first paragraph, in what sense do AIDS or drugs corrupt American life

A．They are a mental threat.
B．They lead to addiction.
C．They violate immune system.
D．None of the above.
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单项选择题
Crack is most popular among _______.
A．college students
B．black people
C．teenagers
D．white middle class
单项选择题
The cause-and-effect relation between AIDS and drugs probably is that _______.
A．AIDS results in drug use
B．drugs helped the spread of AIDS
C．drugs prevented the spread of AIDS
D．drug addiction is the consequence of the spread of AIDS
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