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
<上一题 目录 下一题>
热门 试题

单项选择题
If a person is not allowed to follow his before-sleep routine, he will probably ______.
A．not sleep well
B．never fall asleep
C．lose his memory
D．begin to daydream
单项选择题
The longest time a human being can survive without sleep is probably ______.
A．five days
B．seven days
C．ten days
D．twelve days
相关试题