化学反应前后元素种类不变。以下是植物的光合作用过程:CO2 + H2O淀

化学反应前后元素种类不变。以下是植物的光合作用过程:CO2 + H2O淀粉 + O2,可推断淀粉(       

 A、由碳、氢、氧三种元素组成                           B、由碳、氢两种元素组成

C、含有碳、氢两种元素组成,但不能判断是否含有氧元素   D、条件不足,无法推断

答案

C

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