单项选择题

Generally speaking, all kinds of materials will expand when heated but will ______ when cooled.

A．contrast
B．contract
C．survive
D．return
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单项选择题
Don't let your mother tongue ______ with the foreign language you are learning.
A．interpret
B．confuse
C．interfere
D．puzzle
单项选择题
If only I ______ more money, I could buy a color TV set.
A．have
B．had
C．have had
D．could have
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