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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单项选择题
A.dateB.orderC.contactD.touch
A.date
B.order
C.contact
D.touch
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单项选择题
A.toB.overC.onD.for
A.to
B.over
C.on
D.for
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