求教GWD-TN 18-Q41 的BF题

icefiremin

41 GWD-29-Q28

Astronomer:  Observations of the Shoemaker-Levi comet on its collision course with Jupiter showed that the comet broke into fragments before entering Jupiter’s atmosphere in 1994, but they did not show how big those fragments were.  Nevertheless, some indication of their size can be inferred from spectrographic analyses of Jupiter’s outer atmosphere.  After the fragments’ entry, these analyses revealed unprecedented traces of sulfur.  The fragments themselves almost certainly contained no sulfur, but astronomers believe that the cloud layer below Jupiter’s outer atmosphere does contain sulfur.  Since sulfur would have seeped into the outer atmosphere if comet fragments had penetrated this cloud layer, it is likely that some of the fragments were at least large enough to have passed through Jupiter’s outer atmosphere without being burned up.

In the astronomer’s argument, the two portions in boldface play which of the following roles?

A.The first is a claim that the astronomer seeks to show is true; the second acknowledges a consideration that weighs against the truth of that claim.

B. The first is a claim that the astronomer seeks to show is true; the second provides evidence in support of the truth of that claim.

C. The first and the second are each considerations advanced in support of the conclusion of the argument.

D. The first provides evidence in support of the conclusion of the argument; the second is that conclusion.

E. The first is a circumstance for which the astronomer seeks to provide an explanation; the second acknowledges a consideration that weighs against the explanation provided by the astronomer.

答案是C。

文章的结论应当是：it is likely that some of the fragments were at least large enough to have passed through Jupiter’s outer atmosphere without being burned up.

第二个BF部分也的确是支持这一结论的一种consideration，因为句中出现了“would ... if ....”这样的字眼。而第一个BF的确也是支持文章结论的，但我难以理解第一个BF说的是分析中显示在碎片进入后显示了sulfur的痕迹，这不是作为分析结果吗，怎么会是“consideration”呢？

我心向明月

Consideration有两个意思（具体看选项中的上下文，很容易判断是哪个意思）：
1) “考虑因素”，包括Evidence/Fact
2) “结论”，包括conclusion/inference

推荐你读一读听雪大侠的：[原创]逻辑Boldface解题一般性原理（讨论稿）
http://forum.chasedream.com/GMAT_CR/thread-19296-1-1.html

icefiremin

很有用！非常感谢！！！

flyingbunny

Consideration有两个意思（具体看选项中的上下文，很容易判断是哪个意思）：
1) “考虑因素”，包括Evidence/Fact
2) “结论”，包括conclusion/inference

受教了。