不定项选择

利他行为必然会让利他者付出代价。（）‌

A．正确
B．错误

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单项选择题

Which of the following needs is not in the five-type hierarchy of human needs

A、safe needs
B、social needs
C、esteem needs
D、emotional needs

单项选择题

等音程有三类。（）
A. 对

B. 错