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题库解析   >   细节题题型   >   RC530-543
    本题由hyman1提供
132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-P459-605题】

According to the passage, which of the following is a prediction that is based on the strength of the gravitational attraction of small asteroids?

    <p>(A) Small asteroids will be few in number.</p><p>&nbsp;</p><p>(B) Small asteroids will be monoliths.</p><p>&nbsp;</p><p>(C) Small asteroids will collide with other asteroids very rarely.</p><p>&nbsp;</p><p>(D) Most small asteroids will have very fast rotation rates.</p><p>&nbsp;</p><p>(E) Almost no small asteroids will have very slow rotation rates.</p><p>&nbsp;</p><p><br/></p>
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答案:
B

解题思路

:定位在第二段的第二层。


A 没有提到数量少

B 最后一句话的同义转换,正确

C 没有提到与其它小行星的撞击频率

D 没说大部分的小行星是快的

E 没说小行星几乎都很快


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