单项选择题

A．The paper is destroyed by chemicals.
B．They are often handled improperly by readers. [C] The ink used in printing damages the paper.
C．The glue used in the binding loses its strength.
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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.
填空题
It will take several different insects operating year-round to ___________________________________________.
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