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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
可以从海水中提取铀，但是成本高于市场价。因此，只要提取成本不下降，从海水中提取就没有商业价值。
问评价。结论在于从海水提取方法是否有商业价值。所以应该跟方法和价值有关。
A 陆地上的铀是否会快速枯竭，如果是，那么想要得到铀，就只能从海水中提取，如果不是，那么从海水中提取就没有商业价值，正确。
B 铀应用是否离开采的地方近，无关
C 是否有先进的技术可以降低从海水提取铀的成本，无关
D 海水中的铀数量是否比陆地上的多，无关
E 从淡水中提取是否比从海水中提取成本低，无关
选A
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