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题目内容
Saturn' s planetary ring system is arguably the _______________
structure known to humankind: it has an end-to-end dimension equivalent to the distance traveled by circling Earth seven times but a vertical height about that of a house.
- Adensest
- Bflattest
- Cleast elliptical
- Dmost asymmetrical
- Eleast complex
B显示答案
以上解析由 考满分老师提供。