Prep 1_16
16. (27621-!-item-!-188;#058&003223)
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
正确答案为：A
为什么C不对啊，最后一句说了除非从海水里提取U的成本降低，要不然这种获得U的方法不会在商业上通用。
C答案说是否有技术方法能够使提取U的方法成本降低，这不是正好吗？如果回答是，是正评价，回答否是负评价。
, "but the cost of doing so is greater than the price that uranium fetches on the world market."
引用:" 为什么C不对啊，最后一句说了除非从海水里提取U的成本降低，要不然这种获得U的方法不会在商业上通用。 C答案说是否有技术方法能够使提取U的方法成本降低，这不是正好吗？如果回答是，是正评价，回答否是负评价" " 不管是正的评价还是负的评价都不能回答是不是降的比: the price that uranium fetches on the world market."低..... 而现在的这种价格是, 从LAND DEPOSIT提取当中得到的．．． 所以， 如果， deposits on land ， 海水提取就不会商业化． 否则， deposits on land is rapidly being depleted， 海水提取就会商业化． 这题出得挺阴的．
为什么C不对啊，最后一句说了除非从海水里提取U的成本降低，要不然这种获得U的方法不会在商业上通用。
C答案说是否有技术方法能够使提取U的方法成本降低，这不是正好吗？如果回答是，是正评价，回答否是负评价"
"
不管是正的评价还是负的评价都不能回答是不是降的比: the price that uranium fetches on the world market."低.....
而现在的这种价格是, 从LAND DEPOSIT提取当中得到的．．．
所以， 如果， deposits on land ， 海水提取就不会商业化．
否则， deposits on land is rapidly being depleted， 海水提取就会商业化．
这题出得挺阴的．
谢谢姐姐，呵呵……太强了，以后GMAT问题就问你啊……
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