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 are slowly falling apart.
C．They were not made from wood pulp.
D．They should be stored in a cold place.

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