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lo and Europa, the inner two of Jupiter's four largest moons, are about the size of Earth’s moon and are composed mostly or entirely of rock and metal. Ganymede and Callisto are larger and roughly half ice. Thus, these four moons are somewhat analogous to the planets of the solar system, in which the rock- and metal-rich inner planets are distinct from the much larger gas- and ice-rich outer planets. Jupiter's moons are, however, more "systematic" :many of their properties vary continuously with distance from Jupiter. For example, lo is ice-free, Europa has a surface shell of ice, and while Ganymede and Callisto are both ice-rich, outermost Callisto has more.
This compositional gradient has geological parallels, lo is extremely geologically active, Europa seems to be active on a more modest scale, and Ganymede has undergone bouts of activity in its geological past. Only Callisto reveals no geological activity. In similar fashion, Callisto's surface is very heavily cratered from the impact of comets and asteroids; Ganymede, like Earth’s moon, is heavily cratered in parts; Europa is very lightly cratered; and no craters have been detected on lo, even though Jupiter's gravity attracts comets and asteroids passing near it, substantially increasing the bombardment rate of the inner moons compared to that of the outer ones. But because of lo's high degree of geological activity, its surface undergoes more-or-less continuous volcanic resurfacing.
【OG18-P374-428题】
According to the passage,the difference in the amount of cratering on Callisto's and lo's respective surfaces can probably be explained by the difference between these two moons with respect to which of the following factors?
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细节题，定位依据crating，定位于文章中第二段，从文章中第二段的以下两句：Only Callisto reveals no geological activity. In similar fashion, Callisto’s surface...But because... continous volcanic resurfacing可以推测地质活动的频繁程度和坑面的形成数量成反比。当前版本由 千千 更新于2017-12-11 15:49:35 感谢由 千千 对此题目的解答所做出的贡献。
A错误，文章第一段提及了大小
B错误，与冰体无关，同样，ice也是第一段的内容
C错误。尽管来自于文章第二段，但与本题无关
D错误，文中未提及
E正确，提及了第二段的关键词geological activity
错选了C因为最后这部分没认真看：
Europa is very lightly cratered; and no craters have been detected on lo, even though Jupiter's gravity attracts comets and asteroids passing near it, substantially increasing the bombardment rate of the inner moons compared to that of the outer ones. But because of lo's high degree of geological activity, its surface undergoes more-or-less continuous volcanic resurfacing.
首先bombardment是撞机的意思，文章说Lo上找不到陨石坑，但是木星的重力确实会吸引彗星，这增加了内部卫星（Lo）相较于外部卫星（Call..）的撞击率.但是Lo的高程度的地质活跃度或多或少会有连续的火山resurfacing 重点就在resurfacing表面重修修复。
所以就是L之所以不像C那样布满陨石，是因为他有表面修复能力，而这种能力是活跃的地质导致的
所以区别是地质活跃度不是与木星距离远近也不是被撞击概率
如何解释L星的crater比C星少？ 如果用爆炸来解释，应该越靠近Jupiter的L星更容易遭到小行星的撞击，导致更多的crater； 所以最后一句进一步解释，因为L星更加活跃，crater是火山导致的， 所以选E：地理活性导致了L星和C星crater数量的差异
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2021-10-07 09:32:44
In similar fashion, Callisto's surface is very heavily cratered from the impact of comets and asteroids; Ganymede, like Earth’s moon, is heavily cratered in parts; Europa is very lightly cratered; and no craters have been detected on lo, even though Jupiter's gravity attracts comets and asteroids passing near it, substantially increasing the bombardment rate of the inner moons compared to that of the outer ones. 这一句定位到Callisto's surface，但是没有提到Callisto和lo的main difference，因此要看上下句； 上句：Only Callisto reveals no geological activity. 下句：But because of lo's high degree of geological activity, its surface undergoes more-or-less continuous volcanic resurfacing. 解题。错选C因为看到了L星的bombardment，但是C星没有提到，不能作为main difference.
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2021-05-25 08:55:52
main difference 所以这两者都是要涉及到 C星：Only Callisto reveals no geological activity. In similar fashion, Callisto's surface is very heavily cratered from the impact of comets and asteroids 第一句是总起no geological，后边是表现 I星But because of lo's high degree of geological activity, its surface undergoes more-or-less continuous volcanic resurfacing. 提到了high geological activity 所以应该是与geological 有关 错选C的原因是只看到了C星而没去关注l星，以后做比较题时记得两者的最大差异点
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2019-12-18 09:56:34
定位错误，正确的定位一定要涵盖题干的大部分信息
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2018-11-21 20:16:59
原来是这样
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2018-10-12 10:54:20
虽然做对了，但是花了超额的时间来回头理解细节部分的逻辑
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2017-05-05 22:34:03
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