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
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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