20. Which two gases are believed to have dominated Farth's first (primary) atmosphere?
(A) H & He
(B)N₂&O₂
(C)H₂O &O₂
(D)CO₂&O₂ T
(E) He &O₂

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統計： A(1), B(0), C(0), D(0), E(0) #3049938

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B1 · 2025/11/18

#7118564

1. 題目解析本題詢問的是地球早期（即...

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