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燃烧是人类利用最早的化学反应之一，下列有关燃料的说法不正确的是…………( )

A．汽车用乙醇汽油可以有效地减少汽车尾气的污染，还可以节约石油资源

B．海底蕴藏着新能源——可燃冰，若开采过程中泄漏于大气中会造成温室效应

C．氢能源是最清洁的能源，但由于制取成本高且贮存困难，还不能广泛使用

D．煤、石油、天然气是三大化石燃料。凡是有石油的地方，都有天然气存在