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    精英家教网 > 初中英语 > 题目详情
    Which of the following does paper burn in?
    A．CO2B．N2C．HeD．O2
    D
    CO2 二氧化碳； N2氮气；He氦气；O2氧气。句意：纸张在下列哪种气体中燃烧？结合常识，可知选Ｄ。
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