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
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单项选择题
Why is the tsetse fly a problem in Africa
A．People do not like the sound it makes.
B．It eats food that people need.
C．It has killed many cattle herds.
D．It can destroy the crop there.
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.
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