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GRE阅读模拟在线练习附答案二百六十四

2019-05-08 15:49:06来源：网络

　　为了帮助大家高效备考GRE，新东方在线GRE频道为大家带来GRE阅读模拟在线练习附答案二百六十四，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!

　　The Earth's magnetic field is generatedas themolten iron of the Earth's outer core revolvesaround its solid inner core. When surges in themolten iron occur, magnetic tempests arecreated.At the Earth's surface, these tempests canbe detected by changes in the strength of the Earth'smagnetic field.For reasons not fully understood. thefield itself reverses periodically every million years orso. During the past million years, for instance, the magnetic north pole has migrated betweenthe Antarctic and the Arctic.

　　Clearly, geophysicists who seek to explain and forecast changes in the field must understandwhat happens in the outer core. Unlike meteorologists, however, they cannot rely onobservations made in their own lifetimes. Whereas atmospheric storms arise in a matter ofhours and last for days, magnetic tempests develop over decades and persist forcenturies.Fortunately scientists have been recording changes in the Earth's magnetic field formore than 300 years.

　　In the passage, the author is primarily concerned with

　　A.analyzing a complicated scientific phenomenon and its impact on the Earth’s surfacefeatures

　　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’ methodologicalapproaches to it

　　D.comparing two distinct fields of physical science and the different research methodsemployed in each

　　E.proposing an explanation for a geophysical phenomenon and an experiment that couldhelp confirm that explanation

　　The passage suggests which of the following about surges in the Earth’s outer core?

　　A.They occur cyclically every few decades.

　　B.They can be predicted by changes in the Earth’s inner core.

　　C.They are detected through indirect means.

　　D.They are linked to disturbances in the Earth’s atmosphere.

　　E.They last for periods of about 1 million years.

　　It can be inferred from the passage that geophysicists seeking to explain magnetictempests ought to conduct research on the Earth’s outer core because the Earth’souter core

　　A.is more fully understood than the Earth’s magnetic field

　　B.is more easily observed than the Earth’s magnetic field

　　C.has been the subject of extensive scientific observation for 300 years

　　D.is involved in generating the Earth’s magnetic field

　　E.reflects changes in the inner core caused by magnetic tempests

　　In the second paragraph, the author is primarily concerned with

　　A.stating a limitation that helps determine a research methodology

　　B.making a comparative analysis of two different research methodologies

　　C.assessing the amount of empirical data in the field of physical science

　　D.suggesting an optimistic way of viewing a widely feared phenomenon

　　E.describing a fundamental issue and discussing its future impact on society

　　正确答案:B C D A

　　以上就是关于“GRE阅读模拟在线练习附答案二百六十四”的内容，更多精彩内容，请关注GRE频道!


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