Q36 是不是因为现在的hole都是由于partial and incomplete rebound造成的（也就是没有compensation）， 而Scientists speculate that early in lunar history是有compensation的 所以这些basins were not formed early in the Moon’s history
Scientists speculate that early 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 beneath the impactors almost immediately, compensating for（补偿，填补） the ejected material and thus leaving no low gravity anomaly in the resulting basin. Later, however, as the Moon grew cooler 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.
According to the passage, the gravitational compensation referred to in line 33 is caused by which of the following?
A. A deficit of mass resulting from the creation of a hole in the lunar surface
B. The presence of material from the impactor in the debris created by its impact
C. The gradual cooling and stiffening of the Moon’s outer layer
D. The ejection of massive amounts of debris from the Moon’s crust
E. The rapid upwelling of material from the lunar mantle
首先很好定位，找到原文附近
Scientists speculate that early 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 beneath the impactors almost immediately, compensating for the ejected material and thus leaving no low gravity anomaly in the resulting basin.
这段话提到了什么嘞，大概看一哈有debris to be ejected, material rose后面compensating从句就是在解释题中compensation了不用细看了
那就排除掉ABC 再分析DE
到底是debris还是materials呢 我是从语法分析入手的
compensating紧接的是material 应该是解释material的作用
再次阅读原文和题干 发现是同意转换（rose up-upwelling）
就是这样 E
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发表于 2009-10-26 18:23:00
