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 the mongooses in Jamaica killed off the rats they ______.
A．attacked the humans
B．ate the sugar crop
C．became problems themselves
D．had nothing to eat
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
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