8. 由题干关键词storage and transportation 以及massive but not suitable for定位至第三个标题How do you store and transport the hydrogen?下第一段第三句Compressing the gas requires energy, and compressed hydrogen contains far less energy than the same volume of gasoline. 压缩氢气需要能量,而且压缩后的氢气所包含的能量远远低于同样体积的汽油。据此,答案应改写为being compressed.
9. 由题干关键词obstacle,transportation和be overcome定位至第三个标题How do you store and transport the hydrogen?下第三段第三句Stations will not develop quickly until there is a storage technology that clearly dominates the marketplace. 只有在出现一种占市场主导地位的储存技术后,氢气站才会迅速发展起来。根据句意,结合题干中的dominant提示,答案应为storage technology.
10. 由题干关键词advantages over traditional ones和 higher efficiency定位至最后一个标题Prospect for the future下第二段第二句fuel cells embody two major improvements over the internal combustion engine: they are about twice as efficient; they can significantly reduce air pollution in cities. 由此可见,题干是该句的同义转述,故空格处应填入air pollution.
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