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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

　　【GRE阅读题目解析:地球的磁场】GRE考试考什么？GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:地球的磁场，答案见下一页，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　查看全部：GRE阅读答案解析(汇总)

　　GRE阅读题目解析:地球的磁场

　　P4

　　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. At the Earth's surface, these tempests can be detected by changes in the strength of the Earth's magnetic field. For reasons not fully understood, the field itself reverses periodically every million years or so.

　　Clearly, geophysicists who seek to explain and forecast changes in the field must understand what happens in the outer core. Unlike meteorologists, however, they cannot rely on observations made in their own lifetimes. Whereas atmospheric storms arise in a matter of hours and last for days, magnetic tempests develop over decades and persist for centuries. (121 words)

　　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

　　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.

　　点击下一页查看答案：

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