题目内容：
下列实验现象描述正确的是（ ）
A磷在空气中燃烧，产生大量的烟雾
B电解水的实验中，负极产生的气体能使带火星的木条复燃
C在CO还原氧化铜的实验中，固体的颜色由红色变黑色
D铁在氧气中燃烧，火星四射，生成黑色的固体
答案解析：
单选题：下列实验现象描述正确的是（ ）A磷在空气中燃烧，产生大量的烟雾B电解水的实验中，负极产生的气体能使带火星的木条复燃C在CO还原氧化铜的实验中，固体的颜色由红色变
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