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
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
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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