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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
arugment在纠结mine里开采还是sea里开采好，一想，sea里开采好贵啊，所以得出结论，除非sea的开采成本降低，否则不会考虑sea。问题是评估argument，做出的最终判断方向是，要么在mine里开采，要么到sea里开采。
a）如果mine枯竭呢，那么正好一个加强，一个削弱
c）看起来降低成本有希望。就算成功了，也可以继续采mine，没有削弱到结论
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