单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

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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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.
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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