单项选择题

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

A．At a supermarket.
B．At a bar.
C．At a library.
D．At a dormitory.

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填空题

The indication of a river that must flow down at each step for the essayist is ______.

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