单项选择题

A．When hunting for food.
B．When sleeping.
C．When being attacked.
D．When communicating with their cousins.
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单项选择题
A．One.B．Four.C．Five.D．None.
A．One.
B．Four.
C．Five.
D．None.
单项选择题
A．They make him feel good.B．They make no impact on him.C．They bore him.D．They make him angry.
A．They make him feel good.
B．They make no impact on him.
C．They bore him.
D．They make him angry.
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