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LuckiPanda · 发表于 2007-7-13 10:21:00

nvm, found answer by searching

[此贴子已经被作者于2007-7-13 13:01:08编辑过]

LuckiPanda · 发表于 2007-7-13 10:22:00

16. The axis of Earth’s daily rotation is tilted with respect to the plane of its orbit at an angle of roughly 23 degrees. That angle can be kept fairly stable only by the gravitational influence of Earth’s large, nearby Moon. Without such a stable and moderate axis tilt, a planet’s climate is too extreme and unstable to support life. Mars, for example, has only very small moons, tilts at wildly fluctuating angles, and cannot support life.

If the statements above are true, which one of the following must also be true on the basis of them?

A.If Mars had a sufficiently large nearby moon, Mars would be able to support life.
B.If Earth’s Moon were to leave Earth’s orbit, Earth’s climate would be unable to support life.
C.Any planet with a stable, moderate axis tilt can support life.
D.Gravitational influences other than moons have little or no effect on the magnitude of the tilt angle of either Earth’s or Mars’s axis.
E.No planet that has more than one moon can support life.

LuckiPanda · 发表于 2007-7-13 10:23:00

A,C,E显然都是错误选项，B是正确的也没什么问题。

不过我觉得D也对啊？题目说了，That angle can be kept fairly stable only by the gravitational influence of Earth’s large, nearby Moon.

都说了ONLY by Moon, 为什么不能推出D选项的，基本不受其它的影响? 是因为题目那句话仅仅是针对Earth而言，所以不能说either Earth's or Mars's吗？还是有别的理解。谢谢～

cakemouse · 发表于 2007-7-13 10:56:00

我对这个题的理解是：文章是说了MOON的影响，可是没有提到其它星球的影响。所以如果非要去说其它星球没有影响，可能有以偏概全的嫌疑。

LuckiPanda · 发表于 2007-7-13 11:43:00

“所以如果非要去说其它星球没有影响，可能有以偏概全的嫌疑。”

但ONLY by 好像就可以理解为其它的没有影响吧？

maomm · 发表于 2008-8-4 11:03:00

why not d

jonathan1987 · 发表于 2008-9-13 09:46:00

我一开始选a的!

yangyuxiao · 发表于 2008-11-17 11:30:00

从原题中不能推出火星的moons对火星倾斜的角度没有影响或影响很小，很有可能是影响也很大，使得火星倾斜的角度变来变去的，不能保持一个stable的角度不变，所以D肯定是错的

jack00000 · 发表于 2008-11-17 11:52:00

以下是引用yangyuxiao在2008-11-17 11:30:00的发言：
从原题中不能推出火星的moons对火星倾斜的角度没有影响或影响很小，很有可能是影响也很大，使得火星倾斜的角度变来变去的，不能保持一个stable的角度不变，所以D肯定是错的

D的主题在说引力，与原文主题无关。

jack00000 · 发表于 2008-11-17 11:55:00

以下是引用LuckiPanda在2007-7-13 10:23:00的发言：
A,C,E显然都是错误选项，B是正确的也没什么问题。

不过我觉得D也对啊？题目说了，That angle can be kept fairly stable only by the gravitational influence of Earth’s large, nearby Moon.

都说了ONLY by Moon, 为什么不能推出D选项的，基本不受其它的影响? 是因为题目那句话仅仅是针对Earth而言，所以不能说either Earth's or Mars's吗？还是有别的理解。谢谢～

做逻辑题不要看单个词的意思，要看一句话的整体意思是什么，一句话的重点在哪里，所谓的既不是地球也不是月球都是建立在重力是他的前提基础上的。D选项的重力才是D这个句话要说的整体意思的中心。

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