狒狒逻辑16

幸运E枪兵 · 发表于 2012-6-13 16:53:32

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.

答案b，想知道d为什么不对

幸运E枪兵 · 发表于 2012-6-14 23:06:07

Iris526 · 发表于 2012-6-14 23:22:50

D 错我的理解是：
D项是说除月亮外，重力影响对地球的或火星的轴线形成倾斜角度基本没有什么作用。但从题目中，我们得不出这样的结论，从题目中我们只知道月亮的重力作用可以使角度保持稳定，但得不出选项D的意思。

幸运E枪兵 · 发表于 2012-6-14 23:28:42

明白了，谢谢

狒狒逻辑16

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