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.

原文说 课堂上课的不及格率低于网络上课的 说明课堂上课的学生成绩更好 根据相关性确定了ad 但是不懂为啥ad方向都和原文是反的 都说网络上课的成绩更好 我还找不出ad之间差别 自己理解题目错了嘛 ？

argument是因为费用大于利润所以广告没有为公司带来长远经济效益 b就是说尽管近期没有体现 但是他们成为royal以后是一个长期的投资 后来肯定是有好处的 d的意思是这个现象是一个自然的发展规律 但是我认为它不能说明这个广告不是没用的

嘻嘻我再问一道数学题！44题我算的x=550，y=11，不明白答案怎么算的c啊，请老师解答，谢谢！

第一题，请问为什么不选A呢，AB是怎么选出B的呢

我选D，正确E 读完5个选项，按逻辑members会比物种更好，剩下DE，觉得差别不大，但D更加直接精炼（感觉正确是E的话和追求效率完全违背了哇，哭）

？？我选C，正确选A AB一组，CDE一组 做错思路：首先看AB开头就有代词their觉得没法指代，内心已经差不多把他俩都排除了，往下看一点，看的比较急，没有彻底清楚句意和结构，就觉得两个逗号了还没有出现主语很奇怪，直接AB全部排除（读是读句意啊啊啊啊，就抓着结构不放是什么鬼，两个逗号是形容词并列修饰。。。）；CDE，对比发现最后都有代词，都会以指代不清，但只有C代词和指代对象相隔最近相对清楚，就选了。（其实看到这里既然都有指代不清为啥不重新看一下AB？？）（问题：代词指代放前面一定就指接下来紧接的名词吗？那么相对代词放在后面还要回头找对应指代，在所有选项都存在代词指代时，放前面是不是总是更好？）（from when…有这种用法吗？）

我选D，正确E AB一组，CDE一组 做错思路：速度的话用介词at 比with 好，CDE中选，对比than前后应该一致，前面既然是速度，后面我认为也应该是名词结构才能并列，所以不应该有is/are（难道说正确选项E是than后省略speeds＋定语连接词which？）

答案是E，面授课记的是A，我选的C。。。啥情况。。。 思路：依靠单复数剩ACE，最后时态差别，去前文找发现都是过去式，排除E，纠结，原文有by所以考虑是不是被动就选了C。

后面应该是完整句子排除C，B指代不清排除，ADE最明显区别就是时态，认为是动作导致activate所以应该是单数，排除D，觉得A比E舒服，错选A。

选了B，正确是 D 读了A觉得SO THAT不对，然后读B觉得逻辑才对（这时其实我应该用这个点去排除就只剩下BD），但我顺着读了，然后排除了C，看到DE都有will，但是原文后面已经有专家正在alarm了，按照句意逻辑我认为不应该还未实行，直接就排除了。