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
The computer center can ______.
A．give the firemen important help in almost every way
B．have limited ways of helping fire-fighters
C．hardly give any useful information for the fire brigade
D．put out every fire automatically
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
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