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GRE外语考试经典试题7 [3]

论文作者:留学生论文论文属性:短文 essay登出时间:2010-05-30编辑:vshellyn点击率:5633

论文字数:630论文编号:org201005301007162455语种:中文论文 Chinese地区:中国价格:免费论文

关键词:GRE外语考试经典试题

-sca)e magnetic field is a remnant of the field the Sun acquired when it formed, and is not sustained against decay. In this model. the solar mechanism dependent on the Sun's magnetiC field runs down more quickly. Thus, the char-(50)
  acteristics of the solar-activity cycle uvuld be expected to change over a long period of time. Modern solar obser- vations span too short a time to reveal whether present cyclical solar aCtivity is a long-lived feature of the Sun,or merely a transient phenomenon.
  17. The author focuses primarily on
  (A) presenting two competing scientific theories concerning solar activity and evaluating geological evidence often cited to support them
  (B) giving a brief overview of some recent scientifrc developments in s'olar physics and assessing their impact on future climatological research
  (C) discussing the difficulties involved in linkinl: ter- restrial phenomena with solar activity and indicating how resolving that issue 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.
  19. According to the passage, late seventeenth- and early eighteenth-century Chinese records are impor- tant for which of the following reasons?
  (A) They suggest that the data on which the Maunder minimum was predicated were incorrect.
  (B) They syggest that the Maunder minimum can- not be related to climate.
  (C) Thcy suggest that the Maunder minimum might be \-'alid only for Europe.
  (D) They establish the existence of a span of unusu- ally cold weather worldwide at the time of the Maunder minimum.
  (E) They establish that solar activity at the tirne of the Maunder minimum did not significantly vary from its present pattern.
  20. The author implies which of the followine about currently available geological and archaeoloeical evidence concerning the solar-activity cycle?
  (A) It best supports the model of solar activity described in lines 37-45.
  (B) It best supports the model of solar activity described in lines 45-52.
  (C) It is insufficient to confirtn either model of solar activity described in the third paragraph.
  (D) It contradicts both models of solar activity as they are presented in the third paragrap论文英语论文网提供整理,提供论文代写英语论文代写代写论文代写英语论文代写留学生论文代写英文论文留学生论文代写相关核心关键词搜索。
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