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.
36题的答案是玫瑰色的部分
把原句取非
[此贴子已经被作者于2006-10-11 20:34:53编辑过] |