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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单项选择题
Many elderly people are suffering from the_______disease, rheumatism, as a consequence of the high humidity there.
A．acute
B．cute
C．slow
D．chronic
单项选择题
Iron and steel expands when heated and_______when cooled.
A．shrinks
B．contracts
C．condenses
D．compresses
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