2015年6月12日GRE真题回忆

2015-06-18 17:08:44 作者:无 来源:匿名 次数:2936

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导读: 环球北美考试院官网为大家带来了2015年6月12日GRE真题回忆​及答案解析,包括写作、阅读、词汇等部分,希望考生都能取得好成绩!
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  环球北美考试院官网为大家带来了2015年6月12日GRE真题回忆及答案解析,包括写作、阅读、词汇等部分,希望考生都能取得好成绩!

  写作部分:

  ISSUE 1:

  The greatness of individuals can be decided only by those who live after them, not by their contemporaries. [Specific Task Instruction: Write a response in which you discuss the extent to which you agree or disagree with the statement and explain your reasoning for the position you take. In developing and supporting your position, you should consider ways in which the statement might or might not hold true and explain how these considerations shape your position.]

  ISSUE 2 : The increasingly rapid-pace of life today causes more problems than it solves.

  阅读部分:

  Astronomers observe a supernova that is dimmer than expected because of dust screening,If a supernova (the explosion of a massive star) triggered star formation from dense clouds of gas and dust, and if the most massive star to be formed from the cloud evolved into a supernova and triggered a new round of star formation, and so on, then a chain of star-forming regions would result. If many such chains were created in a differentially rotating galaxy, the distribution of stars would resemble the observed distribute in a spiral galaxy.

  This line of reasoning underlies an exciting new theory of spiral-galaxy structure. A computer simulation based on this theory has reproduced the appearance of many spiral galaxies without assuming an underlying density wave, the hallmark of the most widely accepted theory of the large-scale structure of spiral galaxies. That theory maintains that a density wave of spiral form sweeps through the central plane of a galaxy, compressing clouds of gas and dust, which collapse into stars that form a spiral pattern.

  1.Which of the following, if true, would most discredit the new theory as described in the passage?

  (A)The exact mechanism by which a star becomes a supernova is not yet completely known and may even differ for different stars.

  (B) Chains of star-forming regions like those postulated in the new theory have been observed in the vicinity of dense clouds of gas and dust.

  (C) The most massive stars formed from supernova explosions are unlikely to evolve into supernovas.

  (D) Computer simulations of supernovas provide a poor picture of what occurs just before a supernova explosion.

  (E) A density wave cannot compress clouds of gas and dust to a density high enough to create a star.

  2. The passage implies that, according to the new theory of spiral-galaxy structure, a spiral galaxy can be created by supernovas when the supernovas are

  (A) producing an underlying density wave

  (B) affected by a density wave of spiral form

  (C) distributed in a spiral pattern

  (D) located in the central plane of a galaxy

  (E) located in a differentially rotating galaxy

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