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题目内容
Which of the following does paper burn in?
A.CO2
B.N2
C.He
D.O2
试题答案
相关练习册答案
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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