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SAT阅读文章模拟一篇

发布时间:2016-03-02  编辑:查字典英语网小编

  下面为大家搜集整理的是一篇SAT阅读模拟文章,包括了文章的阅读和题目的解答两个部分,后面附有正确答案。SAT阅读模拟是大家在备考的后期一定要进行的一个非常重要的过程,有助于大家更好的整合资源,加深对考试的理解。

No very satisfactory account of the mechanism that caused the formation of the ocean basins has yet been given. The traditional view supposes that the upper mantle of the earth behaves as a liquid when it is subjected to small forces for long periods and that differences in temperature under oceans and continents are sufficient to produce convection in the mantle of the earth with rising convection currents under the mid- ocean ridges and sinking currents under the con- tinents. Theoretically, this convection would carry the continental plates along as though they were on a conveyor belt and would provide the forces needed to produce the split that occurs along the ridge. This view may be correct: it has the advantage that the currents are driven by temperature differences that themselves depend on the position of the continents. Such a back- coupling, in which the position of the moving plate has an impact on the forces that move it, could produce complicated and varying motions. On the other hand, the theory is implausible because convection does not normally occur along lines. and it certainly does not occur along lines broken by frequent offsets or changes in direction, as the ridge is. Also it is difficult to see how the theory applies to the plate between the Mid-Atlantic Ridge and the ridge in the Indian Ocean. This plate is growing on both sides, and since there is no intermediate trench, the two ridges must be moving apart. It would be odd if the rising convection currents kept exact pace with them. An alternative theory is that the sink- ing part of the plate, which is denser than the hotter surrounding mantle, pulls the rest of the plate after it. Again it is difficult to see how this applies to the ridge in the South Atlantic, where neither the African nor the American plate has a sinking part. Another possibility is that the sinking plate cools the neighboring mantle and produces con- vection currents that move the plates. This last theory is attractive because it gives some hope of explaining the enclosed seas, such as the Sea of Japan. These seas have a typical oceanic floor, except that the floor is overlaid by several kilo- meters of sediment. Their floors have probably been sinking for long periods. It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins. The enclosed seas are an important feature of the earths surface, and seriously require explanation in because, addi- tion to the enclosed seas that are developing at present behind island arcs, there are a number of older ones of possibly similar origin, such as the Gulf of Mexico, the Black Sea, and perhaps the North Sea.

  1. According to the traditional view of the origin of the ocean basins, which of the following is sufficient to move the continental plates?

   Increases in sedimentation on ocean floors

   Spreading of ocean trenches

   Movement of mid-ocean ridges

   Sinking of ocean basins

   Differences in temperature under oceans and continents

  2. It can be inferred from the passage that, of the following, the deepest sediments would be found in the

   Indian Ocean

   Black Sea

   Mid-Atlantic

   South Atlantic

   Pacific

  3. The author refers to a conveyor belt in line 13 in order to

   illustrate the effects of convection in the mantle

   show how temperature differences depend on the positions of the continents

   demonstrate the linear nature of the Mid-Atlantic

  Ridge

   describe the complicated motions made possible by back-coupling

   account for the rising currents under certain midocean ridges

  4. The author regards the traditional view of the origin of the oceans with

   slight apprehension

   absolute indifference

   indignant anger

   complete disbelief

   guarded skepticism

  5. According to the passage, which of the following are separated by a plate that is growing on both sides?

   The Pacific Ocean and the Sea of Japan

   The South Atlantic Ridge and the North Sea Ridge

   The Gulf of Mexico and the South Atlantic Ridge

   The Mid-Atlantic Ridge and the Indian Ocean Ridge

   The Black Sea and the Sea of Japan

  6. Which of the following, if it could be demonstrated, would most support the traditional view of ocean formation?

   Convection usually occurs along lines.

   The upper mantle behaves as a dense solid.

   Sedimentation occurs at a constant rate.

   Sinking plates cool the mantle.

   Island arcs surround enclosed seas.

  7. According to the passage, the floor of the Black Sea can best be compared to a

   rapidly moving conveyor belt

   slowly settling foundation

   rapidly expanding balloon

   violently erupting volcano

   slowly eroding mountain

  8. Which of the following titles would best describe the content of the passage?

   A Description of the Oceans of the World

   Several Theories of Ocean Basin Formation

   The Traditional View of the Oceans

   Convection and Ocean Currents

   Temperature Differences Among the Oceans of the World

  1E、2B、3A、4E、5D、6A、7B、8B

  以上就是关于SAT阅读文章模拟的全部内容,后面的正确答案没有答案解析。大家在解答这些题目的时候,如果遇到问题,可以自己利用自己掌握的技巧对文章进行进一步的挖掘。这样就能更好的应对SAT阅读考试了。

  

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