老PREP CR1 15（和GWD的BF地方不一样）求prep官方答案和nn解释

tintinc

15.   (26883-!-item-!-188;#058&002985)     [GWD #29-Q28]

Astronomer: Observations of theShoemaker-Levi comet on its collision course with Jupiter showed that the cometbroke into fragments before entering Jupiter's atmosphere in 1994, but they didnot show how big those fragments were.以上描述一个背景  In hopes ofgaining some indication of the fragments' size,目的 astronomers studied spectrographic analyses of Jupiter's outeratmosphere.  These analyses revealedunprecedented traces of sulfur after the fragments' entry. 之前没有转折 The fragments themselves almost certainly containedno sulfur, but many astronomers believe that the cloud layer below Jupiter'souter atmosphere does contain sulfur.  Since sulfur would have seeped into the outeratmosphere if comet fragments had penetrated this cloud layer, it is likelythat some of the fragments were at least large enough to have passed through Jupiter's outer atmospherewithout being burned up.

In the astronomer's argument, thetwo portions in boldface play which of the following roles?

(A) The first presents acircumstance for which the astronomer offers an explanation; the second is part of that explanation.

(B) The first acknowledges aconsideration that weighs against the conclusion of the argument; the second isthat conclusion.

(C) The first acknowledges aconsideration that weighs against the conclusion of the argument; the secondprovides evidence in support of that conclusion.

(D) The first provides evidence insupport of the conclusion of the argument; the second acknowledges aconsideration that weighs against that conclusion.

(E) The first is a judgment advanced in support of theconclusion of the argument; the second is that conclusion.

搜索下来答案应该是E，但还是不确定。我个人的理解BF1和BF2不是对立关系，所以BCD淘汰。哪位nn来解释一下A和E怎么区分？谢谢！！

iBabybear

我是这么想的，先判断这两句boldface是同向关系，这样就排除BCD
然后因为第二个是conclusion 不是explanation 所以选E。
不知道对你有帮助否~

tintinc

嗯谢谢！只是黑脸题每次都很不确定，explanation, conclusion, evidence, claim, strategy, arguement... 有木有举一反三的练习/教程啊？

iBabybear

嗯谢谢！只是黑脸题每次都很不确定，explanation, conclusion, evidence, claim, strategy, arguement... 有木有举一反三的练习/教程啊？

-- by 会员 tintinc (2011/3/11 17:05:12)

介个偶也不太清楚诶。。。
你可以去这几个帖子看看，有没有你需要的。。。正好我也去看一下哈。。嘿嘿~~~
http://forum.chasedream.com/GMAT_CR/thread-12769-1-1.html?SearchText=boldface
http://forum.chasedream.com/GMAT_CR/thread-16729-1-1.html?SearchText=boldface
http://forum.chasedream.com/GMAT_CR/thread-19296-1-1.html?SearchText=boldface
http://forum.chasedream.com/GMAT_CR/thread-333173-1-1.html?SearchText=boldface

tintinc

谢啦~

tintinc

大哭！！！第二遍，又选A了！！！为什么啊？最后一句，有个since不就是解释了嘛？难道since从句是explanation，逗号后面的主句已经进化成conclusion了？是这么理解么？难过死我了

sdcar2010

"It is likely that" expresses an opinion which is the conclusion of the whole argument.

Recognizing the premise and conclusion of an argument can solve half of the CR problems.

tintinc

"It is likely that" express an opinion which is the conclusion of the whole argument.

Recognizing the premise and conclusion of an argument can solve half of the CR problems.

-- by 会员 sdcar2010 (2011/3/27 1:21:46)

Thanks! I will keep it in my mind

zsy020584

文章说了是要确定commet的size, 最后说是...large enough......  所以就是他们的结论。

teddybearj4

sdcar NN,能不能问一下E选项里的BF2是什么意思呀？
the second acknowledges a consideration [that weighs against the explanation （provided by the astronomer）].

最后的那个astronomer是指的是这个argument说话的Astronomer还是指两个BF夹着的那个astronomer？？？