2. 外语
  3. The passage gives a general description of the benefits and potential problems of a hydrogen economy. Possible sources for the

The passage gives a general description of the benefits and potential problems of a hydrogen economy. Possible sources for the

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问题 The passage gives a general description of the benefits and potential problems of a hydrogen economy.
Possible sources for the hydrogen are both electrolysis of water and ______.
选项
答案reforming fossil fuels
解析 本题考查氢的来源，即Where does the hydrogen come from?原文中指出There are two possible sources，即electrolysis of water 和 reforming fossil fuels．
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大学英语四级

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