单项选择题

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

A．A guest and a receptionist.
B．A passenger and an air hostess.
C．A customer and a shop assistant.
D．A guest and a waitress.

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