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
其实c选项对原文结论根本不构成威胁,如果回答是,那就是有这样的科技使成本下降,能够商业化使用,如果是no,那就是没有这样的科技,成本不变,不能够商业化使用,这样看来yes或no都顺从原文结论,没有任何的支持或削弱
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