单项选择题

The average number of hours of sleep that an adult needs is ______.

A．approximately six hours
B．around ten hours
C．about eight hours
D．not stated here
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单项选择题
The word drowsy in the last paragraph means ______.
A．sick
B．stand up
C．asleep
D．a little sleepy
单项选择题
A good title for this passage is ______.
A．Sleep
B．Good Health
C．Dreams
D．Work and Rest
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