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[Reading Comprehension]
试题详情
文章：
| Line | 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 | |
| (5) | 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 | |
| (10) | 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 | |
| (15) | 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 | |
| (20) | 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 | |
| (25) | 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. |
题目：
The passage implies which of the following about the five asteroids mentioned in line 12?
选项:
A、Their rotation rates are approximately the same.
B、They have undergone approximately the same number of collisions.
C、They are monoliths.
D、They are composed of fragments that have escaped the gravity of larger asteroids.
E、They were detected only recently.
答案:
C
提问：
老师您好，这道题不太清楚，我想的是，因为这五个没有速度限制，推导出他们是脱离了重力，所以选了d
解答：
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提问：
老师您好，这道题不太清楚，我想的是，因为这五个没有速度限制，推导出他们是脱离了重力，所以选了d
解答：
点赞2
阅读644
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