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.

请问这道题C选项and前后为什么可以是并列关系？

为什么选A？and之后的instead come是跟will avoid 并列嘛？还有就是 SVO+doing的形式到底能不能用？怎么用？

请问老师 画线部分这句话怎么没有谓语呢？我想了很久是省略了have been? 如果是这样的话，我发现省略的情况会影响我的阅读，可能是我对英文省略这块的语法不熟悉（什么时候可以省略，哪些可以省略等）老师能发我一些关于省略语法的资料我读读嘛，谢谢

从句不知道修饰谁的问题，有就近修饰的说法吗？怎么判断修饰谁呢：第一句 状语从句Where……打括号部分修饰museum还是Italy，说修饰Italy好像也翻译的通；第二句 that引导的从句 打括号部分修饰rationale还是social and political realities？在句中作什么成分呢; 第三句 that从句修饰evidence还是前面的Middle East？从句中的with和but怎么连在一起用呢

求问这个题，麻烦老师简明扼要解答一下 谢谢～

请问老师 如果是the Audubon society and other conversation groups发出的动作，为什么是concerned 不是concerning？画线部分是在句中是什么成分呢

DS. Is the integer n a multiple of 140? 1. N is multiple of 10. 2. N is mutual old of 14. @May老师 这到底在数学基础课里 请问题目里说integer 那么integer 也可以有负数 所以 E的答案 这样理解可以吗。