单项选择题

What does second paragraph mainly discuss

A．Some animals and plants depend on each other for existence.
B．Some animals and plants develop their relationship easily.
C．Some plants depend on each other for food.
D．Some animals live better together.

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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

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.