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By cosmic standards, Earth and its fellow terrestrial planets are chemical _____: they consist of primarily four elements (iron, magnesium, silicon, and oxygen) that are rare elsewhere in the universe.
- A.prototypes
- B.mavericks
- C.malefactors
- D.paragons
- E.old-timers
B显示答案
以上解析由 考满分老师提供。
