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    精英家教网 > 高中英语 > 题目详情

    Metals expand when they are heated and ________ when cooled.


    1. A.
      contact
    2. B.
      reduce
    3. C.
      contract
    4. D.
      contrast
    C
    题意：金属热胀冷缩。contract收缩；缩小，符合题意。
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