2. 外语
  3. The passage gives a general description of both the advantages and disadvantages brought by a hydrogen economy. The key advanta

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

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问题 The passage gives a general description of both the advantages and disadvantages brought by a hydrogen economy.
The key advantages of fuel cells include raising the __________________ and reducing air pollution.
选项
答案efficiency of cars
解析 本题考查fuel cells的优点(advantages)。根据Prospects for the Future部分第二段末可以得知，fuel cell与内燃机相比最大的进步就是提高了效能并减轻了空气污染。
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