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2017年11月18日SAT考试每日一题(阅读).

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  为了让我们更好的适应SAT考试,SAT考试官网每天都会有SAT官方每日一题,下面是澳际小编为您整理的2016年11月18日SAT题目,是阅读题,让我们一起来看一看这道题目吧。

  Critical Reading>Select an Answer

  Light from distant quasars—early galaxies that shine with tremendous brightness—has given researchers a new clue to the origin of vast magnetic fields studding today's galaxies: They were running strong when the universe was only a third of its present age.

  Astronomers had observed that radio emissions from quasars tend to be angled, or polarized, in such a way that powerful magnetic fields must have twisted them. The greater their distance from Earth, the more polarized their light. But researchers didn't know whether the magnetic fields were part of the quasar or were present in galaxies encountered by quasar light as it made its journey to our telescopes.

  So a team led by astronomers from the Swiss Federal Institute of Technology (ETH Zurich) scanned more than 70 of those quasars using the European Southern Observatory's Very Large Telescope in Chile to look for signs of galaxies hiding in front of the quasars. Specifically, they checked for a feature called the magnesium(II) absorption line, a reduction in the intensity of light of a certain wavelength, which is a commonly used indicator that gas from a star-forming galaxy has soaked up that light.

  The researchers report that light from quasars showing the magnesium(II) line was more strongly polarized than light from other quasars in the sample. The interpretation: that light did indeed pass through regular galaxies and that it likely acquired its polarization in the process.

  They estimated the age of the magnetic galaxies by measuring the red shift of the absorption line—the observed reddening of light that occurs when galaxies move rapidly apart. The typical red shift of the inferred galaxies corresponded to an age of 5.2 billion years, study author Francesco Miniati says. Precision measurements of the cosmic microwave background peg today's universe at 13.7 billion years old.

  According to the passage, the astronomers wanted to determine if light emitted by distant quasars was affected by ___

  (A) the number of stars in those quasars.

  (B) those quasars' proximity to galaxies.

  (C) the age of those quasars.

  (D) those quasars' distances from Earth.

  澳际培训提醒各位参加准备sat考试的同学,仔细看完以上的sat考试官网题目,然后再看下面的SAT题目答案更有效哦。

  答案:B

  解析:

  Choice B is the best answer. The passage states that the astronomers used the European Southern Observatory's Very Large Telescope to see if galaxies were "hiding in front of the quasars" and checked to see if gas from those galaxies had "soaked up" those quasars' light. In other words, the astronomers were investigating the fect galaxies near quasars had on the quasars' light.

  以上就是澳际小编为根据SAT考试官网最新信息,为您整理的2016年11月18日SAT题目,目的是为了让我们更好的适应SAT考试,如果在备考过程中遇到任何问题,欢迎随时咨询澳际培训,为您提供最专业、最全面的解答。

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