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[Issue Essay]

试题详情

题目:

Analytical!

选项:

答案:

提问:

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.

解答:

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阅读237729
解答: 郭培月

提问:

老师好…这道CR题错选A能求解释一下么?谢谢!

解答:

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阅读256618
解答: 唐瑭老师

提问:

请教唐瑭老师:og上的题,答案是D,选了A。不明白D为什么对,是因为最后一句的Although强调的是前半句吗?although一般强调后半句还是前半句?

解答:

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阅读256351
解答: 唐瑭老师

提问:

老师这道题不知道该怎么解!我是这么算的 6!/3!*3!得出来的结果再乘以2,等于40,但答案是30,不知道是哪里算错了,还是我理解错了,希望老师解答!

解答:

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阅读255709
解答: 徐小梅老师

提问:

老师图片里是作文的标题和我在规定时间内写的东西,您看看我错误找全了吗?找错的思维有没有跳跃?第一段和第二段的论证可以这样写吗?以及我每次都是三十分钟压线写完,字数也不多,请老师给我提一些思维和写作上的建议,谢谢!

解答:

点赞1
阅读254414
解答: 英吉老师

提问:

老师这道题题目有点看不懂,算不到B选项,不知道是题目理解错了还是公式用错了,求讲解

解答:

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阅读255260
解答: 徐小梅老师

提问:

老师能讲解一下这道题吗?

解答:

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阅读256177
解答: 王文静老师

提问:

老师您好,这道题的题目有一点看不懂,请问是什么意思以及为什么选d?

解答:

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阅读257176
解答: 徐小梅老师

提问:

老师您好,我想问一下这道题E为什么有利于支持文中观点?

解答:

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阅读255928
解答: 唐瑭老师

提问:

@英吉老师,我最近在看您的录播逻辑网课,您不推荐我们回读。但是我在日常练习的时候做不到读一遍就能弄懂句间关系,或者读第一遍有时候连句子一起都不太清楚。那我们想要练就读一遍就可以了解句间关系的能力,并且用在考场的话,平时可以怎样练习呢?

解答:

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阅读256997
解答: 英吉老师

提问:

老师请问这个“or”应该怎么算?

解答:

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阅读256354
解答: 徐小梅老师

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