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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热门试题

单项选择题

From the amount of sleep Napoleon, Edison, and Darwin required, we can conclude ______ .

A．that they were famous
B．that they were executives
C．that they were intelligent
D．none of the above

单项选择题

The amount of sleep required may ______ .

A．vary greatly from one individual to another
B．depend on an individual's age
C．be related to an individual's occupation
D．all of the above