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Questions 22 to 25 are based on the passage you have just heard.

A．It is part of everyday life.
B．It is a unique human trait.
C．It is yet to be fully understood.
D．It is beyond ordinary people.

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单项选择题

Questions 22 to 25 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。