单项选择题

Crack is most popular among _______.

A．college students
B．black people
C．teenagers
D．white middle class
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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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