单项选择题

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单项选择题
A．The early history of bookbinding.B．How old books become valuable.C．Economical ways to protect old books.D．Why some books decay.
A．The early history of bookbinding.
B．How old books become valuable.
C．Economical ways to protect old books.
D．Why some books decay.
单项选择题
A．1016.B．1060.C．508.D．580.
A．1016.
B．1060.
C．508.
D．580.
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