子机构
400-600-1123
logo GMAT备考资讯 答疑社区 GMAT公开课 提分课程

城市电话

申友-中心

免费咨询

咨询热线:

地址:
登录
注册

我的备考方案

获取方案

题库解析   >   特殊套路型题型   >   RC530-543
    本题由hyman1提供
176次学习
RC530-543

When asteroids collide, some collisions cause an asteroid to spin faster others slow it down. If asteroids are all monoliths---single rocks---undergoing random collisions, a graph of their rotation rates should show a bell-shaped distribution with statistical "tails" of very fast and very slow rotators. If asteroids are rubble piles, however, the tail representing the very fast rotators would be missing, because any loose aggregate spinning faster than once every few hours (depending on the asteroid's bulk density) would fly apart. Researchers have discovered that all but five observed asteroids obey a strict limit on rate of rotation. The exceptions are all smaller than 200 meters in diameter, with an abrupt cutoff for asteroids larger than that.

The evident conclusion---that asteroids larger than 200 meters across are multicomponent structures or rubble piles---agrees with recent computer modeling of collisions, which also finds a transition at that diameter. A collision can blast a large asteroid to bits, but after the collision those bits will usually move slower than their mutual escape velocity. Over several hours, gravity will reassemble all but the fastest pieces into a rubble pile. Because collisions among asteroids are relatively frequent, most large bodies have already suffered this fate. Conversely, most small asteroids should be monolithic,because impact fragments easily escape their feeble gravity.

【OG20-P458-603题】

The passage implies which of the following about the five asteroids mentioned? (highlight)

    <p>(A) Their rotation rates are approximately the same.</p><p>&nbsp;</p><p>(B) They have undergone approximately the same number of collisions.</p><p>(C) They are monoliths.</p><p>&nbsp;</p><p>(D) They are composed of fragments that have escaped the gravity of larger asteroids.</p><p>&nbsp;</p><p>(E) They were detected only recently.</p><p><br/></p>
登录申友留学,查看答案及解析
答案:
C

解题思路

:定位在第一段黄色高亮的部分。这道题目的解答需要从选项入手,结合全文内容来进行判断。原文说“除了5个之外,有速度限制“,那么这5个就是速度自由的,即可快可慢的monolith,选c


A 没有说它们的转速率几乎相同

B 没有说它们经历了相同数量的撞击

C 正确

D 原文说是整块石料,不是fragments

E 没有说是最近才探测到的


参与讨论

提交
吉祥物小蜜蜂
联系申友 全国免费咨询热线:400-600-1123

友情链接: 申友雅思 | 申友留学 | 申友GMAT官方微博 | 申友GMAT官方知乎机构账号

Copyright © 2020 All Right Reserved 申友教育 版权所有 沪ICP备17005516号-4 免责声明