单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．He can’t find the tickets.
B．He doesn’t want to sit close to the stage.
C．He would rather stand than sit down.
D．He expects the hall to be crowded.
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单项选择题
The passage mainly discusses______.
A．how scientists are trying to find an effective treatment for drug users
B．how doctors and hospitals should help drug users to quit drugs
C．how a new kind of therapy is developed by scientists
D．how a new kind of therapy works
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