单项选择题

A．One.
B．Two.
C．Three.
D．Four.
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E
单项选择题
A．Because the insects are the most successful creatures.B．Because the insects give birth all the time.C．Because the insects can adapt to new situations quickly.D．Because the insects were the first creatures coming to the earth before humans.
A．Because the insects are the most successful creatures.
B．Because the insects give birth all the time.
C．Because the insects can adapt to new situations quickly.
D．Because the insects were the first creatures coming to the earth before humans.
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