GRE短阅读一道答案求分析~文章：It is now established that the Milky Way is far more extended and of much greater mass than was hitherto thought.However,all that is visible of the constituents of the Milky Way’s corona (outer edge),where

GRE短阅读一道答案求分析~文章：It is now established that the Milky Way is far more extended and of much greater mass than was hitherto thought.However,all that is visible of the constituents of the Milky Way’s corona (outer edge),where
GRE短阅读一道答案求分析~
文章：It is now established that the Milky Way is far more extended and of much greater mass than was hitherto thought.However,all that is visible of the constituents of the Milky Way’s corona (outer edge),where much of the galaxy’s mass must be located,is a tiny fraction of the corona’s mass.Thus,most of the Milky Way’s outlying matter must be dark.
　　Why?Three facts are salient.First,dwarf galaxies and globular clusters,into which most of the stars of the Milky Way’s corona are probably bound,consist mainly of old stars.Second,old stars are not highly luminous.Third,no one has detected in the corona the clouds of gaseous matter such as hydrogen and carbon monoxide that are characteristic of the bright parts of a galaxy.
According to the passage,a bright part of a galaxy typically includes
A.dwarf galaxies and cluster of stars
B.a balaced mixture of old and new stars
C.a large portion of the galaxy's mass
D.part of the corona of the galaxy
E.gases such as hydrogen and carbon monoxide
答案选的是E.我选了C.我的依据是all that is visible ...看的见的部分应该就是明亮的部分咯,where much of the galaxy's mass must be located,说明bright part是galaxy's mass咯?
我想知道答案出处no one has detected in the corona the clouds of gaseous matter such as hydrogen and carbon monoxide that are characteristic of the bright parts of a galaxy.的意思.我个人觉得认为这句话表达的是hydrogen and carbon monoxide不具有星系中明亮部分物质的特征.也就是说这两种气体不是明亮的部分咯?那么答案为什么还选E呢?

GRE短阅读一道答案求分析~文章：It is now established that the Milky Way is far more extended and of much greater mass than was hitherto thought.However,all that is visible of the constituents of the Milky Way’s corona (outer edge),where
1、答案出处句翻译：没有人在corona 的气团物质中探测到如hydrogen、CM等物质,而这两种物质恰恰是星系明亮的特征.
意思就是如果这个星系中有明亮的部分,就一定能探测到H、CM这两种气体.明白否?
明亮 与H、CM 是可以互相推断的.
看你的描述,我感觉这个地方你是对句子的理解有偏差,就是单词认识但是句子没理解好.
2、你认为选C的推断依据是看得见的就是明亮的,可是文中并没有提及任何visible与bright的关系,从文中无法证明这二者是有联系的,这只是你的猜想.
如果all that is visible...后面紧跟一句thus 他们是bright的,那么这道题的选C还是E就值得商榷了.可是现在文中找不到这样的说法.
还有哪里有疑问吗?追问我会继续为你解答^_^
GRE考逻辑,答案只能从原文中来.加油!

这样问，效率有点低，去下载一个gpo模考软件，考g用的人很多，里面都有解析的，都是真题，百度搜索下载一个~~