单项选择题

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

A．It is a subconscious thing.
B．It reflects a lack of self-consciousness.
C．It is unnecessary indeed.
D．It is a kind of conscious act.

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单项选择题

单项选择题

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