请教关于pp2 test 1 hard 阅读题

小傻14UID: 3550375

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

关于10题，我没选b。看过magoosh后，明白对应句为最后一句话。但是这个选项中的gravitational force是怎么infer的？因为最后一句话好像并没有明确提到。而这就反映出我推断题的一个问题，不知道什么时候才是合理的推断，什么时候才算是自己多想而文章并没有提到的。

11.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
11题中a选项对应为原文中的inward and outward，可是一个往里缩一个往外伸，两个不是更靠近了吗？为什么是deflect away呢？

Electron_VoltUID: 3557764

1.前一句话说彗星gravitationally flung  into elliptical orbits ，然后说Astronomers suspect that pairs of planets also engage in this slingshot activity，所以说也是受到重力的影响。

2.deflect：to cause (something that is moving) to change direction。
我当时就想了两个行星各自偏离，倒没想那么多。。。

小傻14UID: 3550375

Electron_Volt 发表于 2014-9-23 13:51
1.前一句话说彗星gravitationally flung  into elliptical orbits ，然后说Astronomers suspect that pairs ...

多谢啊，可是还是不理解11题。。

小傻14UID: 3550375

有没有人帮忙回答一下啊？多谢啊！马上就考试了。

莲心~UID: 3588178

上谷歌 magoosh网上有解说