The passage gives a general description of both the advantages and disadvantages brought by a hydrogen economy. The hydrogen ca

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问题 The passage gives a general description of both the advantages and disadvantages brought by a hydrogen economy.
The hydrogen can be generated from __________________ or produced by reforming fossil fuels.

选项

答案electrolysis of water

解析 本题考查氢的具体生成办法,从而将目标锁定在Where Does the Hydrogen Come From?下。该部分首段指出There are two possible sources,即electrolysis of water 和 reforming fossil fuels。
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