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．Because they are too small to understand the rules.B．Because they are absent-minded.C．Because they have so little time for it.D．Because they are not interested in it.
A．Because they are too small to understand the rules.
B．Because they are absent-minded.
C．Because they have so little time for it.
D．Because they are not interested in it.
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.
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