MBA

您当前的位置:中华网考试 > MBA考试 > 试题中心>英语模拟题> 正文 MBA地图

2014年MBA英语阅读模拟试题及答案四(1)

分类:MBA | 更新时间:2016-07-08 | 来源:转载

  MBA名师现场辅导免费试听预约报名MBA考试题库更多试题练习!

  There are some earth phenomena you can count on, but the magnetic field, some say, is not one of them. It fluctuates in strength, drifts from its axis, and every few 100,000, years undergoes a dramatic polarity reversal—a period when north pole becomes south pole and south pole becomes north pole. But how is the field generated, and why is it so unstable?

  Groundbreaking research by two French geophysicists promises to shed some light on the mystery. Using 80 metres of deep sea sediment (沉淀物) core, they have obtained measurements of magnetic-field intensity that span 11 polarity reversals and four million years. The analysis reveals that intensity appears to fluctuate with a clear, well-defined rhythm. Although the strength of the magnetic field varies irregularly during the short terra, there seems to be an inevitable long-term decline preceding each polarity reversal. When the poles flip—a process that takes several hundred thousand years—the magnetic field rapidly regains its strength and the cycle is repeated.

  The results have caused a stir among geophysicists. The magnetic field is thought to originate from molten (熔化的) iron in the outer core, 3,000 kilometers beneath the earth's surface. By studying mineral grains found in material ranging from rocks to clay articles, previous researchers have already been able to identify reversals dating back 170 million years, including the most recent switch 730,000 years ago. How and why they occur, however, has been widely debated. Several theories link polarity flips to external disasters such as meteor (陨星) impacts. But Peter Olson, a geophysicist at the Johns Hopkins University in Baltimore, says this is unlikely if the French researchers are right. In fact, Olson says intensity that predictably declines from one reversal to the next contradicts 90 percent of the models currently under study. If the results prove to be valid, geophysicists will have a new theory to guide them in their quest to understand the earth's inner physics. It certainly points the direction for future research.

  1.Which of the following titles is most appropriate to the passage?

  A.Polarity Reversal: A Fantastic Phenomenon of Nature.

  B.Measurement of the Earth's Magnetic-Field Intensity.

  C.Formation of the Two Poles of the Earth.

  D.A New Approach to the Study of Geophysics.

  2.The word "flip" (Line6, Para, 2) most probably means "___".

  A. decline

  B. intensify

  C. fluctuate

  D. reverse

  3.What have the two French geophysicists discovered in their research?

  A.Some regularity in the changes of the earth's magnetic field.

  B.Some causes of the fluctuation of the earth's magnetic field.

  C.The origin of the earth's magnetic field.

  D.The frequency of polarity reversals.

  4.The French geophysicists' study is different from currently prevailing theories in____.

  A.its identification of the origin of the earth's magnetic field

  B.the way the earth's magnetic intensity is measured

  C.its explanation of the shift in the earth's polarity

  D.the way the earth's fluctuation rhythm is defined

  5.In Peter Olson's opinion, the French experiment_____.

  A.is likely to direct further research in the inner physics of the earth

  B.has successfully solved the mystery of polarity reversals

  C.is certain to help predict external disasters

  D.has caused great confusion among the world's geophysicists

  参考答案:A D A C A

免责声明:

1.鉴于各方面资讯调整与变化,本网所提供的信息仅供参考,敬请以公布信息为准。

2.本网注明来源稿件均为转载稿,免费转载出于非商业性学习为目的,版权归作者所有。

3.中华网考试倡导尊重与保护知识产权,如发现本站文章存在内容、版权或其它问题,请及时联系。联系方式:QQ邮箱:2287829342@qq.com、18988787135,我们将及时沟通与处理。