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 m survive in the preserves.
D．They will gradually die out.
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单项选择题
A．He rarely noticed when students are late.B．He is usually punctual.C．He advised his students to wear watches to class.D．He has been unpredictable.
A．He rarely noticed when students are late.
B．He is usually punctual.
C．He advised his students to wear watches to class.
D．He has been unpredictable.
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