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    精英家教网 > 高中英语 > 题目详情
    Many human activities also _______carbon gases, which will result in global warming.
    A．put offB．send offC．let offD．set off
    C

    试题分析：考查词组：A. put off推迟，B. send off为…送行，寄出，发出，派往C. let off释放，D. set off出发，引发，引爆，句意：很多人类的活动也释放出二氧化碳，这导致全球气温变暖。选C。
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