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2011-09-28 16:39:00   来源：作文地带整理    双击单词自动翻译

　　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.