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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
  P5

  1

  It is now established that the Milky Way is far more extended and of much greater mass than was hitherto thought.

  银河系远比之前想象得更广阔,质量也远超之前的估计,这是已经被广为接受的观点。

  2

  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.

  然而,银河系边缘的可见部分,当然银河系大部分质量都集中在边缘,只占银河系总质量的很小比例。

  3

  Thus, most of the Milky Way's outlying matter must be dark.

  所以,大部分银河系的边远物质一定是暗的。

  4

  Why? Three facts are salient.

  何以?主要有三个原因。

  5

  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.

  首先,银河系中边缘的恒星大多捆绑地进入矮星系和恒星团,这些大多是老恒星。

  6

  Second, old stars are not highly luminous.

  第二,老恒星不会太亮。

  7

  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.

  第三,在银河系边沿从未观测到某些气态物质,诸如氢气和一氧化碳形成的云,而通常这些是一个星系发光部分的典型特征。

  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

  选D

  表述了一个结论:

  银河系比之前想象的更广阔,质量更大。

  列举了三个证据:

  也就是文中的three facts。

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

  句1:

  “It is now established that the Milky Way is far more extended and of much greater mass than was hitherto thought. ”

  这个不需要讲,字面对字面。

  以上就是新东方在线GER频道为你带来的GRE阅读题目解析:银河系边远物质是暗的,更多精彩敬请关注新东方在线GRE频道。

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