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题库 / Prep2007E1-CR-16
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?
Whether the uranium in deposits on land is rapidly being depleted
Whether most uranium is used near where it is mined
Whether there are any technological advances that show promise of reducing the cost of extracting uranium from seawater
Whether the total amount of uranium in seawater is significantly greater than the total amount of uranium on land
Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater
老师：请问AC选项怎么比？我错选了C
选项C的意思是“是否有技术能确保减少开采成本”。但文章让我们评价的不是这个层级的事情。文章的结论是：直到有这种技术为止，这个开采方法都是商业上不可行的。无论有没有这种技术，都不妨碍有这种技术之后的事情嘛~
明白了，谢谢老师，所以文章让我们评价的是有了这种技术后，开采方法在商业上可不可行，所以和有没有这种技术本身没关系，对吗？
是的是的。
谢谢老师
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