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.
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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 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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A．How hydrothermal vents are formed.B．How living things get energy from sunlight.C．The harmful effects of certain chemicals in the ocean.D．Microorganisms that get energy from chemical reactions.
A．How hydrothermal vents are formed.
B．How living things get energy from sunlight.
C．The harmful effects of certain chemicals in the ocean.
D．Microorganisms that get energy from chemical reactions.
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