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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
注意：有一点点绕
premise：从seawater中提取u的话成本太高，高于市场价格
结论：除非成本降下来，否则就从seawater中提取u就没有商业可行性
gap：注意，这个结论成立的前提是，市场价格不会升高，也就是说其他渠道的u的攻击不会大幅的减小，所以这个时候降低从seawater中提取的成本是唯一商业化的渠道。
但是如果其他渠道的u的供给慢慢在枯竭了，这个时候，不用降低cost就可以使seawater这个method to be commercially，因为只有它是唯一的攻击方了，随便要价都可以。
题目evaluate的是结论中降价的唯一性！！！
一定一定要注意极端词汇！！
注意体会文本逻辑！！！
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