单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．A professor and a student.
B．A hotel manager and a tourist.
C．A salesman and a customer.
D．A store owner and his manager.

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单项选择题

单项选择题

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。