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题库 / Prep2007E1-CR-15
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. In hopes of gaining some indication of the fragments' size, astronomers studied spectrographic analyses of Jupiter's outer atmosphere. These analyses revealed unprecedented traces of sulfur after the fragments' entry. The fragments themselves almost certainly contained no sulfur, but many 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 presents a circumstance for which the astronomer offers an explanation; the second is part of that explanation.
The first acknowledges a consideration that weighs against the conclusion of the argument; the second is that conclusion.
The first acknowledges a consideration that weighs against the conclusion of the argument; the second provides evidence in support of that conclusion.
The first provides evidence in support of the conclusion of the argument; the second acknowledges a consideration that weighs against that conclusion.
The first is a judgment advanced in support of the conclusion of the argument; the second is that conclusion.
错选A选项：
The first presents a circumstance for which the astronomer offers an explanation; the second is part of that explanation.
第一个黑体中，只展示了一个事实+天文学家的观点，并没有说明天文学家是如何解释为什么碎片不含硫之类的观点，因此A错误；
E选项：更合理，第一个黑体展示了观点，第二个黑体根据该观点得出了结论
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