It’s necessary for human beings to breath _______ and plants can produce it. A．CO2 B．H2 C．O2 D．N2
It’s necessary for human beings to breath _______ and plants can produce it.
A、CO2
B、H2
C、O2
D、N2
发布时间：2025-06-07 08:24:25
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答案：C
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