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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
这题好绕。只能根据答案倒推逻辑，这个题目不是问从海里提取铀的成本有没有可能降低，而是问整件事有没有意义。评估这件事的首要考虑是做这件事到底有没有意义，而不是这件事里的东西可行不可行。如果陆地上的铀足够多的话，那何必去海水里提取呢？不用去海水里提取就更不用考虑它的成本问题了
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