【2015年内蒙古自治区赤峰市】甲烷（CH4）燃烧的化学方程

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【2015年内蒙古自治区赤峰市】甲烷（CH₄）燃烧的化学方程式为 CH₄ + 2O₂^点燃CO₂ + 2H₂O，该化学方程式中不存在的物质种类是（）

A．单质

B．氧化物

C．盐

D．有机化合物

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