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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.
A．Storms and floods.
B．Disease and fire.
C．Rapid increase of the animal population.
D．Less space for their growth.
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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