单项选择题

The underlined word "they" in the last sentence of the first paragraph refers to

A．birds and parasites
B．birds and sheep
C．parasites and sheep
D．sheep, birds and parasites
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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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