单项选择题

According to the passage, how often does REM sleep occur in one night（）

A．Once
B．Twice
C．Four or five times
D．Forty times

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单项选择题
One who has an intelligent mind is （）

A．very strong
B．healthy
C．very clever
D．stupid
填空题
A. reply B. freely C. ugly D. lonely
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