单项选择题

A．They will face extinction without artificial reproduction.
B．They will have to migrate to find new homes.
C．They will be able to survive in the preserves.
D．They will gradually die out.
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单项选择题
A．The direction to fly in.B．The distance to fly.C．The height to fly.D．The kind of food to find.
A．The direction to fly in.
B．The distance to fly.
C．The height to fly.
D．The kind of food to find.
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