扫描二维码，直接登录
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
问题焦点主要是A和C选项。
请注意题干里Evaluate这个词，一个选项可以evalute一个argument，主要是两个方向：strengthen/weaken。
选项A显然weaken了“海水开采成本降低才可商用”的argument
然而，选项C没有strength这个argument，只是把argument的conditon重复了一遍。
登录 或 注册 后可以参加讨论