请大家帮我看看一道黑脸题gwd29-28

mimixiaxia

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?

 

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.

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.

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

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

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.

 我选了E,当时选不出来,就猜了一个E,答案是C
我做黑脸题一向很好,结果栽在它手上了......
这题真的不太明白,特别是第一个加黑的句子

wslinfeng

After the fragments’ entry, these analyses revealed unprecedented traces
of sulfur. （一个进一步的发现） ...... 
Since sulfur would have seeped into the outer atmosphere if comet fragments
had penetrated this cloud layer,（得出推论的原因） 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. (文中的主要推论，注意没有against任何东西，只是进一步对how big的推测)
ab选项The first is a claim that the astronomer seeks to show is true，不是claime，是一个研究结果。weighs against也不
对。
d选项he first provides evidence in support of the conclusion of the argument; the second is that conclusion。前部分勉强算对，但是后半部分conclusion错。是cause。
eThe
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.千部分勉强对，后半部分against错。
c：The first and the second are each considerations advanced in support of the conclusion of the argument.都是支持结论需要考虑的事项，事实，原因都是支持结论的，其实做黑脸题主要搞清楚，原因，结果，事实，削弱，加强就大致可以了，好好体会

mimixiaxia

哦,明白了,感谢LS这么详细地解答
我发现我做题时没好好读明白题意，因为看到是科技类的就开始头大了

sundaysu

选E。

第一句是EVIDENCE，实实在在的EVIDENCE，没错。

第二局是一个CONSIDERATION，用来衡量天文学家发现的。这不能笼统说是EVIDENCE,应该说是一个理论，经验等等，这根第一句的EVIDENCE是有区别的，因为EVIDENCE必须是直接从该事件中提取出来的。第二局不是该事件的发现，所以不能算EVIDENCE。

running2k

#1LS的解释很好，赞！