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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
题目要求的是评价：【成本高 → 海水提取法不可行】这个逻辑链
也就是如果【成本】怎么样，对【是否使用海水提取法】的影响。
C选项只是单纯讨论了成本能不能降下来，也就是只讨论了逻辑链的前半段。
举个例子就有点类似，讨论的是下大雨了是要出门还是在家里，但是C选项讨论的是会不会下雨。
1.cost下降2.price大于cost 两个条件导致商业化成功，c成立的话，cost下降，price未知，结论未知，取非，cost上升，price未知，结论未知
但是当陆地上资源消耗得差不多，水里的自然替代陆上的，价格自然会上升，cost不变，方案可行；陆地上依旧的话，水里的价格不变，cost不变，方案不可行
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