23．Why does the author give the example in the last but one paragraph?

　　A．To tell us that we produce energy while using hydrogen power

　　B．To tell us that hydrogen power does not produce pollution

　　C．To show hydrogen power can stop war

　　D．To show hydrogen power is cheap

　　答案：A　推理题。根据文章倒数第二段1,2行Some scientists see radical changes in the way the human race co­operates, Hydrogen creates electricity, and is also created by it. With dual use fuel cells, everyone who consumes energy could also produce it. 可知举这个例子就是为了告诉我们在分离出hydrogen的时候，我们也需要消耗电能等其他能源。故A正确。

　　24．What is the passage mainly about?

　　A．war and energy

　　B．the future of hydrogen as an energy resource

　　C．the disadvantages of oil

　　D．How to end war

　　答案：B　主旨大意题。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hydrogen的困难等。故B正确。

　　B

　　Simply saying “thank you” may benefit both the person who is thanked and the person who expresses gratitude(感激)，according to the results of studies conducted by researchers at Florida State University in Tallahassee.

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