单项选择题

If a person is not allowed to follow his sleep routine, he will probably ______ .

A．not sleep well
B．never fall asleep
C．lose his memory
D．begin to daydream
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单项选择题
How do some countries protect elephants from being hunted
A．By persuading ivory hunters.
B．By trying to take more care of elephants.
C．By establishing elephant preserves.
D．By fighting with ivory hunters.
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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