单项选择题

The writer implies that ______.

A．sleep is important for good mental and physical health
B．a light sleep is as restful as a deep sleep
C．memory is improved during sleep
D．sleep is relatively unimportant for human beings
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单项选择题
The longest time a human being can survive without sleep is probably ______.
A．five days
B．seven days
C．ten days
D．twelve days
单项选择题
If a person is not allowed to follow his before-sleep routine, he will probably ______.
A．not sleep well
B．never fall asleep
C．lose his memory
D．begin to daydream
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