单项选择题

A．It learns to say by imitating what people say.
B．It learns to say by imitating what people hear.
C．It learns to say by thinking.
D．It learns to say by seeing.
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单项选择题
A．She felt embarrassed in class.B．Her presentation received a poor grade.C．She had not completed her assignment.D．She was unable to attend her psychology class.
A．She felt embarrassed in class.
B．Her presentation received a poor grade.
C．She had not completed her assignment.
D．She was unable to attend her psychology class.
问答题
In the case of birds, when__________, the union is terminated, the pair separate, and each chooses a mate again.
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