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1998年考研英语阅读第五篇


  原文+翻译:
英语学习
  Scattered around the globe are more than 100 small regions of isolated volcanic activity known to geologists as hot spots.
  地球上散落分布着一百多个互不相连的小火山活动区,被地质学家称为热点。
  Unlike most of the world’s volcanoes, they are not always found at the boundaries of the great drifting plates that make up the earth’s surface; on the contrary, many of them lie deep in the interior of a plate.
  和世界上大多数火山不同的是,它们并不总是在构成地球表面的巨大漂流板块之间的边界上被发现;相反,许多热点深藏于板块内部。
  Most of the hot spots move only slowly, and in some cases the movement of the plates past them has left trails of dead volcanoes. The hot spots and their volcanic trails are milestones that mark the passage of the plates.
  大多数热点只缓慢地移动,有时,经过这些热点的板块运动留下了死火山的痕迹。热点及其火山痕迹是标志板块迁移的里程碑。
  That the plates are moving is now beyond dispute.
  板块漂移这一理论现在是毋庸置疑的。
  Africa and South America, for example, are moving away from each other as new material is injected into the sea floor between them.
  以非洲和南美洲为例,由于有新的物质注入二者之间的海底,两大洲正在彼此分离。
  The complementary coastlines and certain geological features that seem to span the ocean are reminders of where the two continents were once joined.
  但互相吻合的海岸线和某些似乎跨越海洋的地质特征会使人想到这两个大陆曾经是连在一起的。

  The>  携带这些大陆的板块的相对运动已经能够被详细地阐述出来,
  but the motion of one plate with respect to another cannot readily be translated into motion with respect to the earth’s interior.
  但一个板块相对另一板块的运动还不能轻易地解释为相对于地球内部的运动。


  It is not possible to determine whether both continents are moving in opposite directions or whether one continent is stationary and the other is drifting away from it.
  Hot spots, anchored in the deeper layers of the earth, provide the measuring instruments needed to resolve the question. From an analysis of the hot-spot population it appears that the African plate is stationary and that it has not moved during the past 30 million years.
  人们不能确定两个大陆是在朝相反的方向运动,还是一个大陆停止不动而另一个从它身边漂移开去。位于地球更深层的热点提供了解决该问题所需要的测量仪器。从热点地区的人口情况分析来看,非洲板块似乎是静止不动的,在过去3000万年里都没有移动过。
  The significance of hot spots is not confined to their role as a frame of reference.
  热点的重要性不仅限于作为参照体系这一作用。
  It now appears that they also have an important influence on the geophysical processes that propel the plates across the globe.
  现在看来,它们还对推动板块在地球表面漂移这一地球物理过程有重要影响。
  When a continental plate come to rest over a hot spot, the material rising from deeper layers creates a broad dome. As the dome grows, it develops deep fissures (cracks);
  当大陆板块漂移到热点上方,来自地球深层的物质便形成了巨大的圆顶状隆起物。随着这个圆顶的增长,板块出现深深的裂缝。
  in at least a few cases the continent may break entirely along some of these fissures, so that the hot spot initiates the formation of a new ocean. Thus just as earlier theories have explained the mobility of the continents, so hot spots may explain their mutability (inconstancy).
  至少有几次,大陆可能会沿着其中的一些裂缝完全裂开了,因此这个热点就引发了一个新的海洋的形成。这样,正像早期的理论解释了大陆的移动性一样,热点理论或许能解释大陆板块的不稳定性。


  试题:
  51.The author believes that.
  [A]the motion of the plates corresponds to that of the earth’s interior
  [B]the geological theory about drifting plates has been proved to be true
  [C]the hot spots and the plates move slowly in opposite directions
  [D]the movement of hot spots proves the continents are moving apart
  52.That Africa and South America were once joined can be deduced from the fact that.
  [A]the two continents are still moving in opposite directions
  [B]they have been found to share certain geological features
  [C]the African plate has been stable for 30 million years
  [D]over 100 hot spots are scattered all around the globe
  53.The hot spot theory may prove useful in explaining.
  [A]the structure of the African plates
  [B]the revival of dead volcanoes
  [C]the mobility of the continents
  [D]the formation of new oceans
  54.The passage is mainly about.
  [A]the features of volcanic activities
  [B]the importance of the theory about drifting plates
  [C]the significance of hot spots in geophysical studies
  [D]the process of the formation of volcanoes
  答案:
  BBDC

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