A、硫在空气中燃烧能生成二氧化硫,不符合题意,故选项错误;B、红磷在空气中能燃烧生成五氧化二磷,不符合题意,故选项错误;C、空气中氧气的含量比较少,铁丝在空气中不能燃烧,但在氧气中能燃烧,故选项正确;D、镁在空气中能剧烈燃烧生成氧化镁,不符合题意,故选项错误;故选C.
nnmn I have to be at the 22 world cup in Brazil and get involved with the project is a good thing