单项选择题

The fact that the number of one kind of animal may have much to do with that of other animals

A．is not recent knowledge
B．has just been learned
C．has not proved yet
D．is not important now
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单项选择题
When predators control fails, nature brings animals population into balance by ______.
A．eliminating the number of predators
B．increasing the number of other animals
C．seeking the help of disease to reduce other animals
D．replacing the number of predators immediately
单项选择题
In the third sentence of the first paragraph the word deal could best be replaced by ______.
A．barter.
B．bargain.
C．are involved.
D．are concerned.
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