单项选择题

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

[A] The early history of bookbinding. [C] Economical ways to protect old books.
[B] How old books become valuable. [D] Why some books decay.

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单项选择题

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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。