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
From the text, we can infer that ______.
A．computer will be easier to operate
B．automobile will be move comfortable
C．illiteracy rate will be down
D．computer will be set in automobiles
单项选择题
According to the author, the effective way to spread the use of computers is to teach ______.
A．how to use computers
B．what computers use
C．where computers can be used
D．how computers work
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