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.

a sequence 是由 26 个字母:21 个辅音 5 个元音中随机抽叏三个组成,问抽到的这三 个字母里有 at least 2 vowels 有多少种可能? 铅笔是我写的 绿色的是机经给出的答案 请老师指导我的思路的问题 多谢！

这里的时态不理解。为什么后面是would have 是虚拟语气的话前面不应该是had gone吗？

早安麻烦老师帮我解答一下61题，我不懂这个解释。我的思路是：9个人两组，人数多那一组最多不能超过6个人，那么一共有两种分法 4 5和3 6 。然后结合题目要求人多的那一组必须包含固定的五个人 a b c e f , 如果是 4 5 分 多的那一组只能是这五个人 那分法是固定的。如果是 3 6 分 六人组里面固定五个人 剩下一个从剩下的四个人里选一个搭配是 C 41 ,所以一共有四种分法 。总共五种分法满足题目要求 所以我觉得这个概率应该是 5/210

麻烦老师给我解答一下68题，如图例举的是十个点里面选六个的所有情况，那肯定包含一种情况是六个点相邻的，这种情况就不能构成一个六边形，所以这个答案是否有点问题？还是我哪里想错了呢？

Such as 是插入语 which为什么不能指代wild places？怎么判断用限定还是非限定性从句？

我能判断出的： A . but also 单独出现的时候表示转折（不太确定这里） B. 留着了，B让我看着不顺的地方是 主句的also 感觉是和前定从呼应，说不上是什么错，但.. C. 原因状从because 后不是完整句子 D. 比较对象不一致， 应该是...as the Moon (has) E. 我选了E，感觉句子说的很清晰，唯一心有余悸的就是这个so, 选的时候 把so 当做了副词看 问题： 1.E的不好是因为 so 表示“所以”的意思时，是连词要连接2个完整句么？ 2. 请老师讲解B 也欢迎纠正我做题思路的错误 多谢❤️！

如果一个句子里面有过去时和现在完成时，这两个动作哪个是先发生的？ 如果一个句子里面有过去时和过去完成时，这两个动作哪个是先发生的？ 如果句子中间是用；分开的的两个句子时态还会相互影响吗？ 这个题目里面after是介词不是时间状语从句对吗？

"思路： -觉得同位语比which好，排除AB -D的that was not successful有歧义 因为可 修饰到kings或者是achievement 上；排除 -CE里面 觉得C好 but后面虽然省略了主语 但这句的主语就只有other S kings"；it就是指前面的那个事，觉得没毛病； 我的问题是：（1）C这里没有E好的的原因是 but之后没有主语么 ？（2）E里面 "without success"修饰的是谁呢？是other S kings， 还是other S kings的这个动作？像 主谓宾 with xxx这种结构，with在最后的话 一般修饰的是啥？ 谢谢老师！

Years before the advent of plate tectonics―the widely accepted theory, developed in the mid-1960's, the holds that the major features of Earth's surface are created by the horizontal motions of Earth's outer shell, or lithosphere―a similar theory was rejected by the geological community. In 1912, Alfred Wegener proposed, in a widely debated theory that came to be called continental drift, that Earth's continents were mobile. To most geologists today, Wegener's The origin of Continents and Oceans appears an impressive and prescient document, containing several of the essential presumptions underlying plate tectonics theory: the horizontal mobility of pieces of Earth's crust; the essential difference between oceanic and continental crust; and a causal connection between horizontal displacements and the formation of mountain chains. Yet despite the considerable overlap between Wegener's concepts and the later widely embraced plate tectonics theory, and despite the fact that continental drift theory presented a possible solution to the problem of the origin of mountains at a time when existing explanations were seriously in doubt, in its day Wegener's theory was rejected by the vast majority of geologists. Most geologists and many historians today believe that Wegener's theory was rejected because of its lack of an adequate mechanical basis. Stephen Jay Gould, for example, argues that continental drift theory was rejected because it did not explain how continents could move through an apparently solid oceanic floor. However, as Anthony Hallam has pointed out, many scientific phenomena, such as the ice ages, have been accepted before they could be fully explained. The most likely cause for the rejection of continental drift―a cause that has been largely ignored because we consider Wegener's theory to have been validated by the theory of plate tectonics―is the nature of the evidence that was put forward to support it. Most of Wegener's evidence consisted of homologies―similarities of patterns and forms based on direct observations of rocks in the field, supported by the use of hammers, hand lenses, and field notebooks. In contrast, the data supporting plate tectonics were impressively geophysical―instrumental determinations of the physical properties of Earth garnered through the use of seismographs, magnetometers, and computers. 我选了E considerable overlap前面是despite XXX说明这个是个成就，他和后面的反对W的观点的事情是相反的。所以感觉D说用这个词的目的是解释为啥W理论。请老师辨析DE！谢谢！

希望May老师回答一下，我理解的题目意思是有v又有c的是1/30，有v的total是1/10，那么有v没有c的是2/30。有c的total是1/5，那么没有c的total是4/5，所以没有c也没有v的是（4/5-2/30）=11/15，可是给出的答案是A，不知道哪里搞错了。