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        1. 精英家教網 > 初中英語 > 題目詳情
          Which of the following does paper burn in?
          A.CO2B.N2C.HeD.O2
          D
          CO2 二氧化碳; N2氮氣;He氦氣;O2氧氣。句意:紙張在下列哪種氣體中燃燒?結合常識,可知選D。
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