单项选择题

A．It’s cheaper.
B．It’s safer.
C．It’s quicker.
D．It’s easier.
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单项选择题
A．Avoid social situations.B．Stop taking certain drugs.C．Take naps during the day.D．Sleep eight hours a night.
A．Avoid social situations.
B．Stop taking certain drugs.
C．Take naps during the day.
D．Sleep eight hours a night.
填空题
S8. What is the main topic of the passage
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