求助！！GWD17-Q36 我觉得文章提及的现象自我矛盾

sad0oo

顶

sad0oo

顶一个礼拜都没人看。。。还是算了吧。。

plusy1912

如果没有物质补充就会重力异常，以前moon有物质补充所以不会重力异常，现在这种补充因为Moon grew cooler and less elastic，所以现在应该异常了。 so，选A。（关键在前面的yet，这题要看 scientists 前面部分解题比较快，既然都说了 scientists 的观点正确，往前看，找the large multi-ring impact basins ）

evyren

顶一个 楼上的见解 有点懂了 但是对A选项还是不理解 题意倒是理解了

cheer129

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.  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.

这里意思是说的三个不同时段形成的basin的gravity anomaly不同
early in lunar history会发生compensation-->那时形成的basin就have no low gravity anomaly   
Later,(是指later in the lunar history)，因为 Moon grew cooler and less elastic-->compensation would be partial and incomplete--》那时形成的basin就有一点gravity anomaly了
today： Moon is too cold and stiff--》compensation probably would not occur--》此时形成的basin最有gravity anomaly

姦蕉

IMO the ans is A.

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

A.    were not formed early in the Moon’s history
[As stated in the passage, it is speculated that the gravitational compensation took place in the early moons history (denser mantle form the Moon's mantle rose up IMMEDIATELY, COMPENSATING for the ejected material and THUS LEAVING NO LOW GRAVITY ANOMALY in resulting basin).
AND
the passage also speculated that the gravitational compensation will probably NOT occur.

THEREFORE, if the MULTI-RING BASIN was formed in the early moon's history, it would probably be compensated.

As the mult-ring basin still exist
=> The Multi-ring basin were THEREFORE "NOT" formed in the early moon's history.

Hopes it helps.

DUOM

cheer129 发表于 2013-5-9 21:56
Scientists speculate that early in lunar history, when large impactors struck the Moon’ ...

好清晰，赞一个！ 虽然可能不会回来看了