单项选择题

Questions 5 to 7 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.
Now listen to the conversation.
What do the speakers mainly discuss

A．A notice on the bulletin board.
B．A book for a class the man is taking.
C．A chemistry class that is being taught.
D．The library reserve’ desk.

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单项选择题

Questions 5 to 7 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now listen to the conversation. What do the speakers mainly discuss 您的浏览器不支持 audio 元素。