单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．Literature.
B．Philosophy.
C．Sociology.
D．History.

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单项选择题

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Laughter is a defense mechanism when reality is too hard or if we hear______.

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。