单项选择题

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

A．Patient and nurse
B．Teacher and student
C．Secretary and client
D．Guest and receptionist

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The passage is mainly about______.

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。