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GRE阅读题目解析:太阳活动的模型

　　题目：

　　Currently, there are two models of solar activity. The first supposes that the Sun's internal motions (caused by rotation and convection) interact with its large-scale magnetic field to produce a dynamo, a device in which mechanical energy is converted into the energy of a magnetic field. In short, the Sun's large-scale magnetic field is taken to be self-sustaining, so that the solar-activity cycle it drives would be maintained with little overall change for perhaps billions of years. The alternative explanation supposes that the Sun's large-scale 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 characteristics of the solar-activity cycle could be expected to change over a long period of time. (140 words)

　　4.Which of the following statements about the two models of solar activity, as they are described in the passage, is accurate?

　　(A) In both models cyclical solar activity is regarded as a long-lived feature of the Sun, persisting with little change over billions of years.

　　(B) In both models the solar-activity cycle is hypothesized as being dependent on the large-scale solar magnetic field.

　　(C) In one model the Sun's magnetic field is thought to play a role in causing solar activity, 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 periodicities longer than a few decades arc considered to be impossible, whereas in the other model such cycles are predicted.

答案

　　1

　　Currently, there are two models of solar activity.

　　当下有两种描述太阳活动的模型。

　　2

　　The first supposes that the Sun's internal motions (caused by rotation and convection) interact with its large-scale magnetic field to produce a dynamo, a device in which mechanical energy is converted into the energy of a magnetic field.

　　第一种假定太阳内部运动(由转动和对流引起)与其大规模的磁场相互作用，相当于一个发电机，把机械能转化为磁场能。

　　3

　　In short, the Sun's large-scale magnetic field is taken to be self-sustaining, so that the solar-activity cycle it drives would be maintained with little overall change for perhaps billions of years.

　　简言之，太阳的大规模磁场被认为是自给自足的，以至于它驱动的太阳活动周期，也许可以几乎无改变地运行数十亿年。

　　4

　　The alternative explanation supposes that the Sun's large-scale magnetic field is a remnant of the field the Sun acquired when it formed, and is not sustained against decay.

　　另一种解释假定太阳的大规模磁场，是其形成时遗留下来的，会随时间不断衰减。

　　5

　　In this model, the solar mechanism dependent on the Sun's magnetic field runs down more quickly.

　　在这种模型中，依赖太阳磁场的太阳系机械运动会更早耗尽。

　　6

　　Thus, the characteristics of the solar-activity cycle could be expected to change over a long period of time. (140 words)

　　所以可以预期的是，太阳活动周期的规律将会在一段较长时期后改变。

　　4.Which of the following statements about the two models of solar activity, as they are described in the passage, is accurate?

　　(A) In both models cyclical solar activity is regarded as a long-lived feature of the Sun, persisting with little change over billions of years.

　　(B) In both models the solar-activity cycle is hypothesized as being dependent on the large-scale solar magnetic field.

　　(C) In one model the Sun's magnetic field is thought to play a role in causing solar activity, 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 periodicities longer than a few decades arc considered to be impossible, whereas in the other model such cycles are predicted.

　　选 B

　　A 第一种是这样的结论，第二种认为会不断衰减。

　　B 正确项。

　　C 两个都认为磁场发挥作用。

　　D 看到 terrestrial phenomena，地球，划掉，文章跟地球没关系。

　　E 即使不认识 periodicity 周期性这个词，也应该根据 are consider to be impossible 排除，因为作者完全没有倾向性的表态。

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