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
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.
单项选择题
No-go areas refers to _______.
A．places where law has a say
B．violent places
C．places with no human trace
D．places where law is observed with arms
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