单项选择题

A．In caves.
B．Inside archaean.
C．On the ocean floor.
D．Far below the Earth’s crust.
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单项选择题
A．They are often handled improperly by readers.B．The paper is destroyed by chemicals.C．The ink used in printing damages the paper.D．The glue used in the binding loses its strength.
A．They are often handled improperly by readers.
B．The paper is destroyed by chemicals.
C．The ink used in printing damages the paper.
D．The glue used in the binding loses its strength.
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 deteriorate.
A．The early history of bookbinding.
B．How old books become valuable.
C．Economical ways to protect old books.
D．Why some books deteriorate.
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