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Q35 to Q37: (This passage was excerpted from material published in 1996.)
When a large body strikes a planet or moon, material is ejected, thereby creating a hole in the planet and a local Line deficit of mass. This deficit shows up (5) as a gravity anomaly: the removal of the material that has been ejected to make the hole results in an area of slightly lower gravity than surrounding areas. One would therefore expect that (10) all of the large multi-ring impact basins on the surface of Earth’s Moon would show such negative gravity anomalies, since they are, essentially, large holes in the lunar surface. Yet data collected (15) in 1994 by the Clementine spacecraft show that many of these lunar basins have no anomalously low gravity and some even have anomalously high gravity. Scientists speculate that early (20) in lunar history, when large impactors struck the Moon’s surface, causing millions of cubic kilometers of crustal debris to be ejected, denser material from the Moon’s mantle rose up (25) beneath the impactors almost imme- diately, compensating for the ejected material and thus leaving no low gravity anomaly in the resulting basin. Later, however, as the Moon grew cooler (30) and less elastic, rebound from large impactors would have been only partial and incomplete. Thus today such gravitational compensation probably would not occur: the outer layer of the Moon is too cold and stiff. Q36: The passage suggests that if the scientists mentioned in line 19 are correct in their speculations, the large multi-ring impact basins on the Moon with the most significant negative gravity anomalies probably - were not formed early in the Moon’s history
- were not formed by the massive ejection of crustal debris
- are closely surrounded by other impact basins with anomalously low gravity
- were created by the impact of multiple large impactors
- were formed when the Moon was relatively elastic
答案是A,我想问怎么推断和去非啊？有点晕！  | 
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发表于 2006-10-27 15:57:00
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