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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
这道题可以直接看结论作答，结论：直到从海水中开采铀的成本下降，否则这种方法不是经济可行的。---言下之意就是这种方法昂贵，只有成本下降，这种方法才行。
问题问的是削弱结论，所以就是相反的结论：无论成本如何昂贵，都要用这种方法。---言下之意就是这种方法与成本无关。
C还是提到了是否有科技减少成本，所以还是与成本比有关。
A陆地上的铀都被耗尽了，所以无论成本如何，都要从海水中开采。
问题问的是find the argument.......
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