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11月GMAT阅读机经:月球形成.

刚刚更新 编辑: 浏览次数:371 移动端

  十一月机经已经都放出来了,相信大家看了之后不难发现很多机经都不过是酒药换新汤罢了,所以大家要把握好这个规律。今天我们就来分享一下GMAT十一月阅读机经,希望对大家备考GMAT考试有所帮助。

  【本月原始】

  阅读:月球产生的原因 1: CO 2 F 3:CA 但是在第二段都被否决了 因为月球的物质和地球的物质虽然接近但是不完全相同 比如iron 和water 少 最后给了一个collision Theory, 说是撞击产生 因为高热 使得iron 和water减少

  【主题思路】:

  3个理论---反驳---新的理论

  【段落大意】:

  第一段:月球产生的原因 1: CO 2:F 3:CA

  F,认为月球是地球在自转的时候抛出去一部分形成的。第二种,COA,认为月球是和地球同时同地 形成的。第三种,CA【capture】,认为月球是在其他地方形成以后被地球的引力给抓住了。

  第二段:否决第一段---没有按照第一段的顺序

  这三种说法都不对。分别给出理由。因为如果是F,那月球应该比现在转得快(好象是这样得,不太肯定了)【应该是地月系统转的更快】。如果是COA,那整个地月系统应该会转地 快【我觉得这应该是更慢吧。。。不确定,但不要紧,考的时候看一下就成】。月球的核心【应该是表面】很小,地表的液态金属【volatile mental,如锌】也很少,【而地球上多】否掉了F和CA。(这里有细节题)总之这一段统统是否掉前三个理论,考了两道细节题。大家仔细看第二段。【后面还说,月球的铁core,应该再大一些,因此否定了COA和capture】

  第三段:新理论

  出新的CC理论,【地球和另一个宇宙中的物体擦肩而过,擦出了月球】这个理论好,【可以解释上一段的所有问题,易挥发金属少是因为擦肩而过时的温度使得这些金属灰发了,对于core的问题,解释为:地球和那个物体侧面擦肩的,而不是正面】

  【题目】:

  1)主旨题

  问主旨,应该是提供证据否认前三个,并在此基础上证明第四个说法。

  2) 如果俘获论是正确的话,月球对地球而应该体现出什么样的特性。我选了好像是spin faster 还是slower 大家做的时候自己关注

  3)以下哪个点成立可以削弱the objection to the 3者之一的一个理论选项无非就是根据第二段内容,改了些月球当前的特性。记得有科学家对月球表面元素的分析有错误,月球crater的厚度被低估还是什么的

  4)问了结构,我选了提出了几个存在问题的理论最后提出了一个教完美的理论。

  5)分别问了前三种假说中的某两种假说为什么不成立

  6)还有一道逻辑,说是如果被俘获成立,那么怎么样加强,就是找到第二段中的反对意见,改写成否定就好了。。。

  【背景资料】:

  THX to Steven Ren, who find it in WIKI

  Several mechanisms have been historically proposed for the Moon&aposs formation 4.527 ± 0.010 billion years ago, some 30–50 million years after the origin of the Solar System.[15] These include the fission of the Moon from the Earth&aposs crust throughcentrifugal forces,[16] which would require too great an initial spin of the Earth,[17] the gravitational capture of a pre-formed Moon,[18] which would require an unfeasibly extended atmosphere of the Earth to dissipate the energy of the passing Moon,[17] and the co-formation of the Earth and the Moon together in the primordial accretion disk, which does not explain the depletion of metallic iron in the Moon.[17] These hypotheses also cannot account for the high angular momentum of the Earth–Moon system.[19]

  The prevailing hypothesis today is that the Earth–Moon system formed as a result of a giant impact: a Mars-sized body hit the proto-Earth, blasting material into orbit around the proto-Earth, which accreted to form the Moon.[20] Giant impacts are thought to have been common in the early Solar System. Computer simulations modelling a giant impact are consistent with measurements of the angular momentum of the Earth–Moon system, as well as the small size of the lunar core.[21]Unresolved questions are the relative sizes of the proto-Earth and impactor,[20] and how much material from these two bodies formed the Moon. However, recent oxygen isotope composition analysis of the Moon shows its oxygen isotope composition is more similar to the Earth&aposs than this hypothesis would suggest.[22]

  The large amount of energy released in the giant impact event and the subsequent reaccretion of material in Earth orbit would have melted the outer shell of the Earth, forming a magma ocean.[23][24] The newly formed Moon would also have had its own lunar magma ocean; estimates for its depth range from about 500 km to the entire radius of the Moon.[23]

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