【OG20-P458-603题】The passage implies which of the following about t_OG18新题_-{$seo

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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)

A

Their rotation rates are approximately the same. 分析A选项
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B

They have undergone approximately the same number of collisions. 分析B选项
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C

They are monoliths. 分析C选项
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D

They are composed of fragments that have escaped the gravity of larger asteroids. 分析D选项
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E

They were detected only recently. 分析E选项
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当前版本由百香果蜂蜜茶更新于2017-08-09 16:53:50 感谢由百香果蜂蜜茶对此题目的解答所做出的贡献。

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

题目讨论（10条评论）

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司令Selin

关键点all but =exceptions 直径＞200m——rubble pile碎石堆——速度非常快的尾部会消失——任何旋转速度超过每几个小时一次的松散聚集体会飞散。直接＜200m——monolith一块巨石——正态分布，尾巴有极快和极慢原文说“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，不会因为速度太快而飞出去消失，可以极快和极慢，符合巨石的旋转条件。

0 0 回复 2022-08-07 01:13:44
水寒528

除了五颗小行星外，其他的都严格自转规律如果不遵守自转规律的话，集合体会肢解的，所以一定是单个崩的小行星

0 0 回复 2021-10-07 16:42:34
ycg200650

请问D怎么排除呢

0 0 回复 2021-06-25 10:16:27
旮旮回复ycg200650

原文对monolithic的描述是single rock

0 0 回复 2021-10-30 10:58:31

潼潼也要上700

开头陈述一项背景信息：当小行星们相撞的时候，有的撞击会使得小行星转得快有的撞击则会使小行星转得慢。
两个if开头的句子描述了两种情况：如果小行星是single rock的话，那么表示其旋转速度的图像会呈现正态分布，也就是说横轴上有极快的存在也有极慢的存在；如果小行星是rubble pile的话，那么图像上极快的部分会消失。
需要理解limit on rate of rotation其实就是指失去极快的部分。第一段的最后一句话其实是给出一个临界值，告诉我们什么样的行星属于monolith（直径小于200米），什么样的行星属于rubble pile。
第二段解释了第一段的最后一句话，告诉读者为什么直径大于200米的会是rubble pile，而直径小于200米的会是monolith

0 回复 2021-01-24 14:41:46

175115uybpy

这不是简单重复文章原意吗……

0 0 回复 2020-11-22 18:35:30
175115uybpy回复175115uybpy

说错了想说的是第十题

0 0 回复 2020-11-22 18:39:37
746860xgow

关键点all but =exceptions

1 0 回复 2020-05-23 10:11:35
harper

这文章看的一脸懵逼。。。

2 0 回复 2019-10-13 18:52:49
谁占用了我ID

Monoliths: fast or small rate Rubble piles: slow rate Five--limited rate=Exceptions--smaller than 200 (第一段结束后其实在暗示第一段给出的单体多体和速度之间的关系是不能反推出小于200的都是rubble piles）所以第二段开头才会说大于200的才是rubble piles Larger than 200--rubble piles --transition: blast to bits→reassemble Large body--rubble piles(frequent collision) Small body--monolithic(feeble gravity) 不知道我的理解准不准确，希望有大神或者老师们能给予指点~~~

1 0 回复 2019-03-04 16:38:49
谁占用了我ID回复谁占用了我ID

Monoliths: fast or small rate Rubble piles: slow rate Five--limited rate=Exceptions--smaller than 200 (第一段结束后其实在暗示第一段给出的单体多体和速度之间的关系是不能反推出小于200的都是rubble piles）所以第二段开头才会说大于200的才是rubble piles Larger than 200--rubble piles --transition: blast to bits→reassemble Large body--rubble piles(frequent collision) Small body--monolithic(feeble gravity)

0 0 回复 2019-03-04 16:40:34
ChloeHH

看不懂怎么做、

0 0 回复 2018-11-03 08:42:45
大毛毛

c 若是p组成的行星，rotator是观察不到的

0 0 回复 2018-09-17 12:56:12