求鉴定，是否GWD答案有误GWD17-Q35 to Q37

ran2010zx · 发表于 2011-4-10 18:26:29

GWD17-Q35to Q37:
(Thispassage was excerpted from material published in 1996.)

When a large body strikes a planet ormoon, material is ejected, thereby creating a hole in the planet and a local deficitof mass. This deficit shows up as agravity anomaly: the removal of thematerial that has been ejected to make the hole results in an area of slightlylower gravity than surrounding areas. One would therefore expect that all of the large multi-ring impactbasins on the surface of Earth’s Moon would show such negative gravityanomalies, since they are, essentially, large holes in the lunar surface. Yet data collected in 1994 by the Clementinespacecraft show that many of these lunar basins have no anomalously low gravityand some even have anomalously high gravity. Scientists speculatethat early in lunar history, when large impactors struck the Moon’s surface,causing millions of cubic kilometers of crustal debris to be ejected, densermaterial from the Moon’s mantle rose up beneath the impactors almost immediately,compensating for the ejected material and thus leaving no low gravity anomalyin the resulting basin. Later, however,as the Moon grew cooler and less elastic, rebound from large impactors wouldhave been only partial and incomplete. Thus today such gravitationalcompensation probably would not occur: the outer layer of the Moon is too cold and stiff.
36. Q36:
Thepassage suggests that if the scientists mentioned in line 19 are correct intheir speculations, the large multi-ring impact basins on the Moon with themost significant negative gravity anomalies probably

A. were not formed early in the Moon’s history
B. were not formed by the massive ejection ofcrustal debris
C. are closely surrounded by other impactbasins with anomalously low gravity
D. were created by the impact of multiple largeimpactors
E. were formed when the Moon was relativelyelastic

像这种SUGEST 题，一般答案不会直接从原文给
通过我标出的部分，反推既得E，答案为A，求牛人鉴定。。。

ran2010zx · 发表于 2011-4-11 16:30:13

happyself · 发表于 2011-5-9 23:40:45

文章主要说的就是没有形成。CDE是方向性错误。在AB里面选。特别是月球还有弹性的时候，会弹回来补充被射出去的物质洞。就更不会形成题目中所说的现象了。早期的时候就是有弹性的时候。所以选A。至于B，我做题的时候犹豫了一下。刚刚给你这么一解释我也理解了。如果现在月球的现在才有物质弹出去的话，就木有东西来填补，还是有可能形成significant negative gravity anomalies的。如果是早期就不会。

总之就是一句话，早期不会，现在可能会（木有明确说，我是infer的）。不知道这么理解对不。讨论，共勉

求鉴定，是否GWD答案有误GWD17-Q35 to Q37

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