求教PP2第一套第二個V的阅读

ying-ingUID: 3015841

hard中关于行星轨道的一篇
The nearly circular orbits of planets in our solar system led scientists to expect that planets around other stars would also reside in circular orbits. However, most known extrasolar planets reside in highly elongated, not circular, orbits. Why? The best clue comes from comets in our solar system. Comets formed in circular orbits but were gravitationally flung into their present-day elliptical orbits when they ventured too close to planets. Astronomers suspect that pairs of planets also engage in this slingshot activity, leaving them in disturbed, elliptical orbits. If two planets form in close orbits, one will be scattered inward(toward its star), the other outward. They will likely then travel close enough to neighboring planets to disturb their orbits also.

10 According to the passage, which of the following factors help account for the elliptical shape of the orbits of extrasolar planet？

A the planet’s formation in close proximity to other planets
B the gravitational influence of planets whose original orbits have been disturbed
C the gravitational influence of comets

请问为什么还选A？
为什么不选c？

ying-ingUID: 3015841

还是这篇
the passage suggests that two planets formed in close orbits that engaged in "slingshot activity" would be likely to

deflect away from each other
change the shape of each other's orbit
affecy the orbits of any neighboring planets
为什么有C？
原文是“They will likely..."  C不算过度推理？

mikko37UID: 2687563

第一个问题


文章用 planet-comet 系统和 star-planet 系统做类比，所以在后一个系统中comet不起作用。

A是文章中说的吧 “If two planets form in close orbits,”。

mikko37UID: 2687563

ying-ing 发表于 2013-8-18 00:01
还是这篇
the passage suggests that two planets formed in close orbits that engaged in "slingshot ac ...

如果是 they are likely 就算是过度推断了吧。they will like ， 这事儿迟早会发生。

要问any算不算过度推断我觉得倒像。

ying-ingUID: 3015841

mikko37 发表于 2013-8-18 01:09
第一个问题

我把两个概念混淆了，谢谢你的解答！
当时做的时候只记得选项在原文中出现过···没有回看

ying-ingUID: 3015841

mikko37 发表于 2013-8-18 01:09
第一个问题

这道我刚发现题干中“would be likely to”所以就和原文“will likely”对应了

xywustUID: 3462520

楼主，我刚也有这个疑问，
以为C是过度推理
看到题目中的一个would be likely to ,
就对应上了。。谢谢

xiaogalayyUID: 3256066

嗯有道理！