单项选择题

______ man is ______ reasoning animal.

A．The, a
B．The, the
C．/, /
D．/, a
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单项选择题
Iron and steel expands when heated and ______ when cooled.
A．shrinks
B．contracts
C．condenses
D．compresses
单项选择题
The ______ of living has kept rising in recent years.
A．expense
B．cost
C．price
D．bill
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