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标题: Prep-1-16 [打印本页]

作者: mchen224 时间: 2009-3-27 15:53
标题: Prep-1-16

16.
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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

C为什么不行呢？

作者: mchen224 时间: 2009-3-27 22:23

急

作者: hansomecd 时间: 2009-3-28 00:48
C为什么行呢？

作者: sonya888 时间: 2009-3-28 22:19
就算有technological advances ，成本很高还是没有用

作者: roimei 时间: 2009-6-15 03:30
in C, "show promise" (=/= promise) can not be useful to determine in evaluating the argument.

作者: stellar724 时间: 2009-6-19 23:44

这道我也有问题~~有NN能详细的解释下吗~~

作者: ed88student 时间: 2009-8-12 18:00
http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=248238&replyID=&skin=0

作者: bubumouse 时间: 2009-8-12 20:39

选A吗

我觉得C没有削弱原题，都是说新技术的存在对于海水提铀这个方法的重要性

而A是一种他因削弱，不一定是降低了成本才能海水提铀，陆地上铀的缺乏也是实施海水提铀的原因

不知道各位nn有啥想法

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