请教 这道GWD 的题。/gwd-13-38

mko

题干结论: F的测金术肯定不正确. 因为测出来那么多金子结果什么都挖不出!
选项只要取非证明F的测金术正确就行.
E, 说金子没有事先加到样本里去. 取非: 金子事先加进去了.
因为金子事先加进去了,所以F测出了那么多金子, 所以测的方法是对的,因为确实有那么多金子在里面,既然方法是对的,即削弱题干的F的测金术不正确的结论.

D 我觉得完全无关,文章什么都没说,干嘛想那么多?一个小破岛已经够烦人的了...

GMAT阿驴

以下是引用lawyer_1在2004-11-25 21:55:00的发言：

将E取非，在样品检验前F放金在样品中。这样F的样品含金高而实际不高的原因就不是方法不对了。结论说方法不对就不成立。故为假设。

易混的是D。好像也是排除他因。但原文说的是检验K岛的金含量。其他岛的情况无关。选D的原因在于认为F用其它岛的样品充当K岛样品。但原文没这层意思。

Frobisher, a sixteenth-century English explorer, had soil samples from LACE>CanadaLACE>’s LACE>LACENAME>KodlunarnLACENAME> LACETYPE>IslandLACETYPE>LACE> examined for gold content.  Because high gold content was reported, LACE>ElizabethLACE> I funded two mining expeditions.  Neither expedition found any gold there.  Modern analysis of the island’s soil indicates a very low gold content.  Thus the methods used to determine the gold content of Frobisher’s samples must have been inaccurate.

Which of the following is an assumption on which the argument depends?

1. The gold content of the soil on Kodlunarn Island is much lower today than it was in the sixteenth century.
   
2. The two mining expeditions funded by Elizabeth I did not mine the same part of Kodlunarn Island.
   
3. The methods used to assess gold content of the soil samples provided by Frobisher were different from those generally used in the sixteenth century.
   
4. Frobisher did not have soil samples from any other Canadian island examined for gold content.
   
5. Gold was not added to the soil samples collected by Frobisher before the samples were examined.

但是原文都没有 加入GOLD的意思啊?

其实这种题就是要排除原文没有给出的原因吧

请大家指正

amber0919

我觉得是不是Ｄ没有说别的土里有没有金子．如果Ｄ改为：Ｆ的sample里没有别的地方的土，这些土里有金子．那么Ｄ就是假设了．

取非．则有可能是别的土里的金子使得Ｆ测出来有金子．而非Ｆ的方法不对．对结论削弱．　所以是假设．

tablesalt

以下是引用麻集爱在2004-6-6 12:15:00的发言：

Frobisher, a sixteenth-century English explorer, had soil samples from Canada’s Kodlunarn
                        Island examined for gold content.  Because high gold content was reported, Elizabeth I funded two mining expeditions.  Neither expedition found any gold there.  Modern analysis of the island’s soil indicates a very low gold content.  Thus the methods used to determine the gold content of Frobisher’s samples must have been inaccurate.

I will go with E.

Premise: Samples from Frobisher and modern explorers generate different results.

Conclusion: Methods used to determine Frobisher's samples were inaccurate.

The question asks for an assumption to support the conclusion. Of course, if the conclusion is sound--namely, if only the methods used to check Frobisher's samples were wrong, supposedly the samples should have been geniune--nobody had tampered with them. This naturally leads to answer choice E.

merci2006

造成gold content test结果有错误的话 只有两种可能既1 sample 有问题 2 方法有问题。所以这是本质 其它选项都提到本质所以错

if conclusion will refer to the mothod inaccurate, then we can get the assumption the sample is not fake.

mymengming

以下是引用lawyer_1在2005-4-9 20:18:00的发言：

答案是E应该没有疑问。原文的假设很显然是排除其他可能性的假设：存在其他可能的情况下，作者只得出一种可能。A解释不了Elizabeth I时代的情况。故无关。B两个家伙开采的是否是同一地方没关系，只要是K岛就行。CF用的办法和哪个时代是否相同没关系。

易混的是D和E。D只要Elizabeth I信的是K岛的土壤的检验结果就行，是否带来其他岛的土壤样品，并送去检验，和原文无关。将E取非，就是送去检验的土壤加了金，当然含量高了。结论就不能成立。

在这里强调一点：也许有人提出含量高了并不排除方法不对的可能性。注意原文的结论是个排他性的结论（MUST BE），所以如果存在其它可能性的情况下，它就不能成立啦

^_^，本来这篇错了很多，结果最后发现居然是答案错的，多谢大律师！！

很精彩，很值得学习

ll_422

以下是引用gmat740在2005-10-5 11:58:00的发言：

其实A、B、、D三个是错误的，因为他们都直接否定了原文的前提，假设的答案应该是在原文前提成立的前提下，什么能帮助结论成立。C明显是五关选想。

agree!直接否定了原文的前提是不行的.

mimixiaxia

UP        

ycgxx

在庵的版本里，是天山第4题。给的答案就是E。 对于假设类型的题目，如果假设是对的，必能推出原文的结论。如果假设不对，则推出的结论就错误。

welldone2007

不敢苟同你的看法。 假设只是结论成立的必要条件， 不是充分条件。 所以假设不对，则推出的结论就错。 但是假设对，则不一定结论对。 比如这题E对， 就是F做没做假了， 就一定可以说测试方法不准确么？