单项选择题

A．18%.
B．40%.
C．70%.
D．17%.
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单项选择题
A．In a natural habitat.B．In the wild.C．In a laboratory.D．In a zoo.
A．In a natural habitat.
B．In the wild.
C．In a laboratory.
D．In a zoo.
单项选择题
A．Too many planes.B．Weather.C．Different regions operate differently.D．All of the above.
A．Too many planes.
B．Weather.
C．Different regions operate differently.
D．All of the above.
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