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
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单项选择题
The author implies that if human beings are kept awake for more than a week the result ______.
A．is hard to imagine
B．will probably be a mental breakdown
C．is difficult to describe
D．will probably be dead
单项选择题
By writing this passage, the writer intends to tell us 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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