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
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单项选择题
If injured, the fireman will ______.
A．be treated immediately with the computer's help
B．hardly get proper treatment with the help of the information given by the center
C．appreciate the computer's help very much
D．ask doctors and nurses for help
单项选择题
From the amount of sleep Napoleon, Edison, and Darwin required, we can concluded ______.
A．that they were famous
B．that they were executives
C．that they were intelligent
D．None of the above
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