Like all dreams of the future, it seems very far away. But the threat of war and terrorism in the Middle East has made governments and businesses more aware of the need to end oil dependency and spend more time and money on hydrogen resource. So maybe the threat of war is not a completely bad thing for the future of the human race.
文章大意:本文主要讲述的是为了我们的资源可能会枯竭,但是我们可以使用新型的hydrogen能源作为我们的主要资源。文章具体描述了分类hydrongen的困难等。
21.What does the underlined word “it”in the last but one paragraph refer to?
A.wealth B.hydrogen
C.electricity
D.fuel
答案:C 推理题。根据本句Some scientists see radical changes in the way the human race cooperates, Hydrogen creates electricity, and is also created by it.可知这里的it就是指前一句里的electricity指这两种物质Hydrogen和electricity是相互依存的。故C正确。
22.What is the problem with using hydrogen as energy?
A.It has byproducts
B.It has to be separated from other materials
C.It will make energy too cheap
D.It is too far away from us
答案:B 推理题。根据文章第三段The problem is that hydrogen is everywhere and nowhere at the same time. It does not exist as a material on its own ,but is always part of something else, So it has to be separated before it can be used.可知最大的问题是hydrogen并不是单独存在的,而是和其他的物质在一起的。所以要使用hydrogen,首先就是要把hydrogen分离出来。故B正确。
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