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题目内容
Saturn's rings, among the most iconic features in the solar system, are not ____________: they're raining so much water onto the planet that in 300 million years they could rain themselves nearly out of existence.
- Aprimordial
- Bcommensurable
- Cimmutable
- Dsymmetrical
- Ehaphazard
C显示答案
以上解析由 考满分老师提供。