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【单选题】
下列说法中不正确的是A.
细铁丝在氧气里燃烧时，火星四射，生成黑色固体
B.
氧气的化学性质很活泼，在常温下能与所有物质发生化学反应
C.
在过氧化氢溶液的分解反应中，二氧化锰起催化作用
D.
用排水法可以收集不易溶于水的气体
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A.
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B.
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C.
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A.
Because of its friendly folks.
B.
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C.
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D.
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