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.
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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
Which statement does this passage lead you to believe
A．It won't be easy to get rid of the tsetse flies in Africa.
B．Sleeping sickness is unknown to Africans.
C．People did not know sleeping sickness could cause deaths.
D．The people there did not know the tsetse carried a kind of disease to man.
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