单项选择题

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

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

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单项选择题

问答题

What we can learn from Paper from Rag is that you had better buy archival materials______.

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