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标题: prep1-16 请大家都来谈谈看法~~~谢谢O(∩_∩)O~ [打印本页]

作者: yahoochao 时间: 2010-3-31 18:08
标题: prep1-16 请大家都来谈谈看法~~~谢谢O(∩_∩)O~

16.(27621-!-item-!-188;#058&003223)

Most of the world's supply of uranium currently comes from mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

Which of the following would it be most useful to determine in evaluating the argument?

(A) Whether the uranium in deposits on land is rapidly being depleted

(B) Whether most uranium is used near where it is mined

(C) Whether there are any technological advances that show promise of reducing the cost of extracting uranium from seawater

(D) Whether the total amount of uranium in seawater is significantly greater than the total amount of uranium on land

(E) Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater

正确答案是A。我选的是D。最后一句是说从海水中提取的uranium是否商业化可行取决于提取的成本。那么，这和A选项中陆上的urnaium是否会被快速的用尽有什么联系？请大家解答~~

作者: yahoochao 时间: 2010-4-4 15:38
NN来帮我解决一下吧~~~感激~~~~~~~~

作者: bengyiam 时间: 2010-4-5 15:40
U 的来源有2个，一个是陆地，一个是海洋，如果陆地上的来源很快耗尽（也就是现在使用U的大部分来源处），另外来源管他成本多高都是得考虑投入商业使用的

作者: yahoochao 时间: 2010-4-5 19:50

U 的来源有2个，一个是陆地，一个是海洋，如果陆地上的来源很快耗尽（也就是现在使用U的大部分来源处），另外来源管他成本多高都是得考虑投入商业使用的

-- by 会员 bengyiam (2010/4/5 15:40:07)

奥~~对哈是这个道理！！O(∩_∩)O~谢谢

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