作者：英吉
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?
(A) Whether the uranium in deposits on land is rapidly being depleted
(B) Whether most uranium is used near where it is mined
(C) Whether there are any technological advances that show promise of reducing the cost of extracting uranium from seawater
(D) Whether the total amount of uranium in seawater is significantly greater than the total amount of uranium on land
(E) Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater
问题分析：
A选项是围绕陆地上U这种东西的存储量来谈的，和文章内容有点关系，留着。
B选项说U会在什么地方使用，围绕的是使用地点，没说过，杀。
C 说有一些技术在将来一定能够把从海水中提取U这个目标实现，围绕的是是否有技术能实现目标谈，没说（别断章取义，这个选项的后半部分显然原文是说过的）
D 说陆地上的U和海洋中的U那个量大，没说过，杀。
E 说从淡水中提取U和从海水中提取U成本是否一样，说两种成本对比，原文也没有说过，杀。
