单项选择题

We learn from the text that corals depend on plants for ______.

A．comfort
B．light
C．food
D．oxygen
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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
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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