老师您好能否帮我讲解下下面这个文章考试时该如何读，我读完这种文章压根不知道在说什么，只知道在讲ocean basin形成机制的几种理论。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 continents. Theoretically, this convection would carry the continental plates along as though they were on a conveyor belt (conveyor belt: n. 传送带) 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 (an abrupt bend in an object by which one part is turned aside out of line) 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 sinking 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 convection 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 kilometers 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 earth’s surface, and seriously require explanation because, in addition 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.

想问下为什么选D 中间没有连接词感觉好怪

请教小梅老师 这个题目 我算的90 为什么不对呢 102这个按照正常列公式该咋列呢？ 谢谢老师

小梅老师请问这道题的几种变体怎么区分呢？ 1）no boy stands btw girls是指BBB和GGG必须在一块是嘛？ GBBG这种也是不允许的嘛？ 2）它和no boy stands btw 2 girls有什么区别嘛？ 3）三男三女排一行 两两隔开又和前面有什么区别

请教39题 谢谢小梅老师

老师 请教一下39和40题 39应该怎么做呢？有点没思路 40是选择E吗老师 谢谢老师！

请问一下唐瑭老师，老师上逻辑课举的试验田的例子，C选项：两块试验田的形状不同，这个是无关的，如果改成：两块试验田的形状不同，但形状也会影响产量，那这个是有关还是无关呢？为什么呢？

请唐塘老师分析一下这道题，我感觉题目中问的是杂志新政策和intended effect之间的关系，我感觉五个选项都无关，老师可以分析一下五个选项吗？谢谢

请唐塘老师分析一下这道题，谢谢，看不懂最后一句话的内容，不知道文章最后一句话的重心是什么

请唐塘老师分析一下这道题，谢谢

这道题C感觉是对的因为可以降低运输成本增加收益