新GRE阅读理解36套每日讨论--68（qq群178674184）

普渡哥

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 (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.

yourpotato

C
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.

韩洋

D  however ……

普渡哥

正确答案：10. D 11. It is now established...  

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