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

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

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问题 Generally speaking, all kinds of materials will expand when heated but will ______ when cooled.
选项 A、contrast
B、contract
C、survive
D、return
答案B
解析 热涨冷缩。
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