单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．They are difficult to read.
B．They were not made from wood pulp.
C．They are slowly falling apart.
D．They should be stored, in a cold place.

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单项选择题

单项选择题

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。