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历年试题:美国GRE试题(一)(4)

时间:2011-09-28来源:作文地带整理栏目:Essay作者:作文地带整理 英语作文收藏:收藏本文
could have an impact on our understanding of solar physics (D) pointing out the futility of a certain line of sci- entific inquiry into the terrestrial effects of solar activity and recommendine ita

  could have an impact on our understanding of solar physics

  (D) pointing out the futility of a certain line of sci- entific inquiry

  into the terrestrial effects of solar activity and recommendine ita

  aban- donment in favor of purely physics-oriented research

  (E) outlinine the specific reasons why a problem in solar physics has

  not yet been solved and faulting the overly theoretical approach of modern

  physicists.

  18. Which of th.e following statements about the two models of solar

  activity. as they are described in lines 37-55, is accurate?

  (A) In both modgls cyclical solar activity is regarded as a long-lived

  feature of the Sun, persisting with little change over billions of years.

  (B) Tn both models the solar-activity cycle is hypothesized as being

  dependent on the large-scale solar magnetic field.

  (C) Tn one model the Sun’s magnetic fieid is thought to play a role in

  causing solar activ- ity, whereas in the other model it is not.

  (D) In one model solar activity is presumed to be unrelated to terrestrial

  phenomena. whereas in the other model solar activity is thought to have

  observable effects on the Earth.

  (E) In one model cycles of solar activity with peri- odicities longer than

  a few decades are con- sidered to be impossible, whereas in the other model

  such cycles are predicted.

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