单项选择题

A．They will gradually die out.
B．They will be able to survive in the preserves.
C．They will have to migrate to find new homes.
D．They will face extinction without artificial reproduction.
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单项选择题
A．He deserves more sympathy than Allen.B．He wants Allen to pay for typing the paper.C．He’s sorry that Allen has to work all night.D．He has to write a paper of his own.
A．He deserves more sympathy than Allen.
B．He wants Allen to pay for typing the paper.
C．He’s sorry that Allen has to work all night.
D．He has to write a paper of his own.
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.
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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