It's necessary for human beings to breathe _______ and plants can produce it. [ ]A. CO2 B. H2 C. O2 D. N2 -初中英语-n多题

◎ 题干

It's necessary for human beings to breathe _______ and plants can produce it.

A. CO₂
B. H₂
C. O₂
D. N₂

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◎ 解析

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◎ 知识点

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