单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A．Giving a lecture.
B．Discussing political science.
C．Working on a science problem.
D．Reading twentieth-century literature.

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单项选择题

Questions 23 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。