单项选择题

Questions 21-23 are based on the talk you’ve just heard. Who are talking in this dialogue

A．A student and a professor.
B．A physicist and a biologist.
C．Two students.
D．Two professors.

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单项选择题

单项选择题

Questions 21-23 are based on the talk you’ve just heard. Who are talking in this dialogue 您的浏览器不支持 audio 元素。