单项选择题

It can be inferred from the directions that this medicine ______.

A．helps you to fall asleep quickly
B．may be dangerous to small children
C．cannot be taken if one feels sleepy
D．should not be taken by children under six

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单项选择题

Which of the following is true

A．People have done. nothing to get rid of the tsetse flies.
B．People are trying to find out ways to get rid of the tsetse flies.
C．No ways can be found to get rid of the tsetse flies.
D．It won't be long before people get rid of all the tsetse flies in Africa.

单项选择题

On the whole, the passage is mainly about ______.

A．the second largest continent in the world
B．a dangerous and unpleasant insect
C．farmland in the heart of Africa
D．a kind of illness that can destroy cattle