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 longest time a human being can survive without sleep is probably ______ .
A．five days
B．seven days
C．ten days
D．twelve days
单项选择题
What does the writer imply according to the passage
A．Male elephants are hunted more than female elephants.
B．Both male elephants and female elephants are equally hunted.
C．Each elephant has a long life.
D．There are not any ivory hunters in the world now.
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