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GRE阅读题目解析:地球的磁场

2017-06-22 09:53:00来源:网络

  1

  The Earth's magnetic field is generated as the molten iron of the Earth's outer core revolves around its solid inner core; when surges in the molten iron occur, magnetic tempests are created.

  地球的磁场,是由液态铁组成的地球外核,绕着固态的地球内核旋转而产生的;当液态铁产生浪涌,就会发生磁暴。

  (tempest 风暴,暴风雨,情绪爆发【'tem-pəst】)

  2

  At the Earth's surface, these tempests can be detected by changes in the strength of the Earth's magnetic field.

  在地表,这些磁暴可以通过地磁场强度的改变探知。

  3

  For reasons not fully understood, the field itself reverses periodically every million years or so.

  由于一些尚未完全被人类理解的原因,地磁场大概每百万年会反转一次。

  4

  Clearly, geophysicists who seek to explain and forecast changes in the field must understand what happens in the outer core.

  显然,想要解释和预报这些磁场变化的地球物理学家,必须搞清楚地球外核里到底发生了什么。

  5

  Unlike meteorologists, however, they cannot rely on observations made in their own lifetimes.

  然而,不同于气象学家,他们无法依赖自己有生之年的观察记录。

  6

  Whereas atmospheric storms arise in a matter of hours and last for days, magnetic tempests develop over decades and persist for centuries. (121 words)

  因为大气中的风暴产生只需数小时而持续数天,但地磁暴的产生需要十年以上且持续上百年。

  7.In the passage, the author is primarily concerned with

  (A) analyzing a complicated scientific phenomenon and its impact on the Earth's surface features

  (B) describing a natural phenomenon and the challenges its study presents to researchers

  (C) discussing a scientific field of research and the gaps in researchers' methodological approaches to it

  (D) comparing two distinct fields of physical science and the different research methods employed in each

  (E) proposing an explanation for a geophysical phenomenon and an experiment that could help confirm that explanation

  选 B

  描述了一种自然现象(地磁场和磁暴如何产生),以及研究中遇到的问题(观测周期太长)。

  8. Select the sentence in the passage that implies the reason why geophysicists seeking to explain magnetic tempests ought to conduct research on the Earth's outer core.

  “The Earth's magnetic field is generated as the molten iron of the Earth's outer core revolves around its solid inner core; when surges in the molten iron occur, magnetic tempests are created. ”

  注意,题目问的是,为什么地球物理学家要研究地球外核。

  因为地磁场是外核围绕内核旋转产生的,所以这个磁场发生变化我们要研究外核。

  以上就是新东方在线GER频道为你带来的GRE阅读题目解析:地球的磁场,更多精彩敬请关注新东方在线GRE频道。

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