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GRE阅读题目解析:银河系边远物质是暗的

2016-11-30 17:21:37来源：网络

　　【GRE阅读题目解析:银河系边远物质是暗的】GRE考试考什么？GRE阅读是重点。新东方在新东方在线GRE频道为大家带来GRE阅读题目解析:银河系边远物质是暗的，答案见下一页，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　查看全部：GRE阅读模拟题及答案解析(汇总)

　　GRE阅读题目解析:银河系边远物质是暗的

　　P5

　　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.

　　10. The passage as a whole is primarily concerned with

　　(A) analyzing a current debate

　　(B) criticizing a well-established theory

　　(C) showing how new facts support a previously dismissed hypothesis

　　(D) stating a conclusion and adducing evidence that may justify it

　　(E) contrasting two types of phenomena and showing how they are related

　　11. Select the sentence that the author implicitly indicates what astronomers believed about the Milky Way until fairly recently.

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