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编辑点评： GRE阅读考试的材料，非常强调逻辑的关系，所以逻辑要点是大家在解GRE阅读题的时候的关键，本文就为大家例举了这样一篇逻辑短文，供大家参考和练习。 随着GRE阅读考试的难度日益增加，大家需要有针对性地进行练习，本文为大家例举的就是逻辑短文的练习，文末还附有答案，供大家更好地练习。 Questions 10 and 11 are based on the following reading passage. 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 ,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. 10. The passage as a whole is primarily concerned with analyzing a current debate criticizing a well-established theory showing how new facts support a previously dismissed hypothesis | 
