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In a flame of pure hydrogen gas， burning in air， the hydrogen reacts with oxygen to form water and releases（）.

In a flame of pure hydrogen gas， burning in air， the hydrogen reacts with oxygen to form water and releases（）.
A.little hydrogen
B.waste
C.energy
D.little oxygen
正确答案：energy

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上一条：（）is the first element on the periodic table， making it the lightest element.Since it is so light， it rises in the atmosphere and is therefore rarely found in its pure form.

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