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标题: 狒狒135_16,拜托大家来看下~~ [打印本页]

作者: satanred 时间: 2007-10-29 11:31
标题: 狒狒135_16,拜托大家来看下~~

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.

答案是B,但是A为什么不对呢?我觉得A和B是一个意思啊.

作者: crazecat123 时间: 2007-10-29 13:02
因为一个星球有个大的行星并不是support life唯一的条件，但是必须的条件之一．

作者: nancyx83 时间: 2007-10-29 14:11
分析的真好，我做的时候也做错了，现在明白了。

作者: satanred 时间: 2007-10-30 10:28
thanks~哈

作者: billytang1980 时间: 2007-11-6 15:36

分析一下：如果AXIS有倾斜角度是23度，这个角度真好能够满足地球的引力需要（kept fairly stable only ）记住only。

推理：没有AXIS倾斜角度，那么行星天气恶化，不足以生命生存。

B中
If Earth’s Moon were to leave Earth’s orbit 代表就是：没有AXIS倾斜角度，月亮就离开地球轨道。 Earth’s climate would be unable to support life地球不支持生命。就是原推理

A
If Mars had a sufficiently large nearby moon：火星有足有大的月亮靠近，并不能说明火星也保持AXIS角度平衡。原题目中支持条件是AXIS有倾斜角度，而不是一个大月亮阿

作者: pansimply 时间: 2012-5-12 14:40

分析一下：如果AXIS有倾斜角度是23度，这个角度真好能够满足地球的引力需要（kept fairly stable only ）记住only。
推理：没有AXIS倾斜角度，那么行星天气恶化，不足以生命生存。
B中
If Earth’s Moon were to leave Earth’s orbit 代表就是：没有AXIS倾斜角度，月亮就离开地球轨道。 Earth’s climate would be unable to support life地球不支持生命。就是原推理
A
If Mars had a sufficiently large nearby moon：火星有足有大的月亮靠近，并不能说明火星也保持AXIS角度平衡。原题目中支持条件是AXIS有倾斜角度，而不是一个大月亮阿

-- by 会员 billytang1980 (2007/11/6 15:36:00)

关于A选项，原文A.If Mars had a sufficiently large nearby moon, Mars would be able to support life.
如果有足够的大的接近的月球，火星可能有生命。这是一个虚拟语气。没说有足够大的近的月球就一定会支持生命。有足够大的近的月球——>火星的轴倾角可能是23度——>火星可能支持生命。看起来也没什么错。

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