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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
s价格降，大家才会用s。问加强。
A，m耗尽。那么价格再贵也得用S的。
B，是否U在被挖的地方用。不管是不是运输费用高，目前M的成本还是要低于S。
C，技术降低S的成本。成本降，价格降，削弱。
D，是否S的量要大于M的量。题目讲了目前大部分还是来自于m，说明m虽然少于s，但还是够用的。
E，淡水可以提取u。那大家都去用淡水提取的u，S的价格更降不了。
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