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题目内容双击单词支持查询和收藏哦～
Whereas water on Mars could plausibly have been delivered by repeated comet impacts in the geologically recent past, the ice on smaller bodies is more difficuIt to attribute to _______________ source.
- A.an exogenous
- B.a primordial
- C.a solitary
- D.a terrestrial
- E.an irreducible
A显示答案
以上解析由 考满分老师提供。
