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    【题目】下列说法正确的是( )。

    A．有氧气参加的反应都是化合反应

    B．化合反应一定是氧化反应

    C．所有化合反应的共同特征是两种物质反应而生成另一种物质

    D．无论是否有氧气参加，只要由两种或两种以上的物质生成另一种物质的反应，就属于化合反应

    【答案】D

    【解析】

    试题分析：A．有氧气参加的反应不一定是化合反应，如蜡烛燃烧。B．化合反应不一定是氧化反应。如生石灰与水反应生成熟石灰。C．所有化合反应的共同特征是两种物质（或两种以上的物质）反应而生成另一种物质。D．化合反应是指两种或两种以上的物质生成另一种物质的反应，不一定需要氧气参加。

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