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.

请英吉老师看一下我这道作文题的找错和论证有什么不足，谢谢！

麻烦唐瑭老师讲解一下这道题的做题思路 谢谢～

麻烦唐瑭老师讲解一下 这道题AC选项以及为什么定位最后一句可以的到A 谢谢～

麻烦金老师讲一下这题C选项，分号后面的句子中is算不算谓语？ 再麻烦老师讲一下这句话意思 谢谢～

麻烦老师分析一下这道bf题 谢谢～

请老师解答一下这个ir题，感觉像加速度有关的物理题，但我忘记公式了

请老师在纸上写一下这道题的过程，谢谢！

英吉老师您好，请问您能够给我解读一下这篇阅读吗？谢谢@英吉

May老师好…117题是一道机经题…请问E为什么不可以。谢谢！

麻烦老师从头到尾讲下这个题，也不太明白为啥CD的choose sb for heading不行，以及C选项的as为啥不行，我记得语法课上讲as是=，在这个题里面Meri…这个人也可以等于这次expedition的head啊，是不是我as的理解有问题，麻烦您详细纠正/指点下，谢谢