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（）has the highest energy content of all known conventional fuels（by weight）.It has almost 3 times more energy content by mass than（）.

（）has the highest energy content of all known conventional fuels（by weight）.It has almost 3 times more energy content by mass than（）.
A.Oxygen， fossil fuels
B.Hydrogen， oil
C.Oxygen， gasoline
D.Hydrogen， gasoline
正确答案：Hydrogen， gasoline
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