SAT阅读文章模拟一篇

　　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

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