Re: [語文] PP1-CR-16

看板GMAT (GMAT入學考試)作者freemind99 (freemind99)時間17年前 (2008/10/16 19:07)推噓2(2推 0噓 1→)

留言3則, 2人參與討論串2/2 (看更多)

※ 引述《CGHS13 (.......)》之銘言： : Most of the world's supply of uraium currently from mines. It is possible to : extract uranium from seawater, but the cost of doing so is greater than the : price that uranium fetches in the world market. Therefore, until the cost of : extracing uranum from seawater can somehow be reduced, this model of obtaning : uraium is unlikely to be commercially viable. : which of the following would it be most useful to determine in evaluating : the arugment? : The answer is A : Whether the uraium in deposit on the land is rapidly being depleted. : 這個答案我可以理解 : but the answer C : Whether there are any technological advances that show prmise if reducing the : cost of extracing uraium from seawater. : 為什麼這個不行阿? 題目原意是大部分現在U的供給來自礦物的開採但是有另一種來源是海底蘊藏但是這種來源要取得U要花比在市場賣出價格更高的成本因此只有在成本降低的情況下這種海底開採的方式才可能有辦法(有人願意)執行題目問evaluate 而這種題目是考與假設很類似的概念只是不一定要成立所以呢重點在於原本陸地上如果還有充沛的蘊藏量要不要去用海底開採就不是所關切的焦點了而C選項海底開採技術的進步並非使本文成不成立的關鍵點一但確定陸地上蘊藏不夠即使技術不佳(無法降低成本)也是要用這種方法就不會有本文推論的 this model of obtaning uraium is unlikely to be commercially viable -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 123.194.203.188