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标题: 请教思路FEIFEI-16,此类题难以思考 [打印本页]

作者: killer34888 时间: 2005-7-2 10:18
标题: 请教思路FEIFEI-16,此类题难以思考

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.

作者: dphxmg 时间: 2005-7-3 17:01

It is an effective way to formalise the reasoning in the stem.

For example, tilt->the existence of the nearby Moon; tilt¬ ->too extreme and unstable->life cannot be supported.

So, B is the key.

作者: pcpcpcpcpc 时间: 2005-7-4 06:23

A. 1.文章说了没有这样的angle就不能有生物。但没说有这样的ANEGLE就一定能有生物，也许ANGLE只是能有生物的条件之一。2.而且也不能推出只有大的NEARBY MOON才能有这样ANGLE。

B. 第二句说的清清楚楚。

C. 理由同A1

D. 理由同A2

E. 文章未提起

作者: hedonism555 时间: 2005-7-5 02:27
A, C commit the same fallacy of confusing necessary condition with sufficient condition.

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