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.
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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
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
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