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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
因果，如果海中取U的价格不降低→取U的方法不会商用
评估，看看有没有干扰因素（CQ1）能够影响U的商用
A、U在陆地上是否储蓄快速下降（暗示U供应不足，需要另外开采），CORRCT
B、U距离Miner近不近，无关价格、海中取U，不是商不商用的他因
C、老师解释得很好了；有没有这样的技术，都不影响取U的方法会不会商用，不是商不商用的他因
D、U海中总量高，无关价格、海中取U
E、U在淡水中提取成本与海中相似，这个对比与取U的方法会不会商用无关，不是商不商用的他因
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