单项选择题

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

A．He thinks it difficult to understand.
B．He thinks it helpful to one’s wisdom.
C．He thinks it isn’t useful at all.
D．He has never thought about it.

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单项选择题

单项选择题

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