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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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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A．An educational problem.B．A health problem.C．A Chemical problem.D．An environmental problem.
A．An educational problem.
B．A health problem.
C．A Chemical problem.
D．An environmental problem.
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