单项选择题

A．Storms and floods.
B．Disease and fire.
C．Rapid increase of the animal population.
D．Less space for their growth.
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单项选择题
A．They could drive the insects away.B．They could keep the plants well-watered.C．They could make the plants grow faster.D．They could build devices to trap insects.
A．They could drive the insects away.
B．They could keep the plants well-watered.
C．They could make the plants grow faster.
D．They could build devices to trap insects.
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