单项选择题

A．Storms and floods.
B．Disease and fire.
C．Less space for their growth.
D．Rapid increase of the animal population.
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单项选择题
School buildings have been neglected for 10 years.
A．Y
B．N
C．NG
单项选择题
A．Two million.B．Three million.C．Five million.D．Six million.
A．Two million.
B．Three million.
C．Five million.
D．Six million.
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