单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．Not clearly specified.
B．Not likely to be met.
C．Reasonable enough.
D．Apparently nonexistent.
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单项选择题
A．Stop thinking about the matter.B．Talk the drug user out of the habit.C．Be more friendly to his schoolmate.D．Keep his distance from drug addicts.
A．Stop thinking about the matter.
B．Talk the drug user out of the habit.
C．Be more friendly to his schoolmate.
D．Keep his distance from drug addicts.
单项选择题
How many kinds of anxiety are mentioned in the passage（）

A．Two.
B．Three.
C．Four.
D．Five.
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