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Pure hydrogen does not occur naturally on Earth in large quantities， and it is locked up in enormous quantities in water， hydrocarbons， and other（）.One of the challenges of using hydrogen as a fuel comes from being able to efficiently extract hydrogen fro

Pure hydrogen does not occur naturally on Earth in large quantities， and it is locked up in enormous quantities in water， hydrocarbons， and other（）.One of the challenges of using hydrogen as a fuel comes from being able to efficiently extract hydrogen from these compounds（化合物）.
A.organic matter
B.plants
C.inorganic matter
D.fossil fuels
正确答案：organic matter

标签：能源英语面面观化合物

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