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：
According to the passage, which of the following is a prediction that is based on the strength of the gravitational attraction of small asteroids?
选项:
A、Small asteroids will be few in number.
B、Small asteroids will be monoliths.
C、Small asteroids will collide with other asteroids very rarely.
D、Most small asteroids will have very fast rotation rates.
E、Almost no small asteroids will have very slow rotation rates.
答案:
B
