Many human activities also _______carbon gases, which will result in global warming.
A．put offB．send offC．let offD．set off
C

試題分析：考查詞組：A. put off推遲，B. send off為…送行，寄出，發(fā)出，派往C. let off釋放，D. set off出發(fā)，引發(fā)，引爆，句意：很多人類的活動(dòng)也釋放出二氧化碳，這導(dǎo)致全球氣溫變暖。選C。
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