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It’s necessary for human beings to breath _______ and plants can produce it.

A．CO2

B．H2

C．O2

D．N2

根據常識對于人類而言呼吸氧氣是必要的，植物能產生氧氣，故選C。A是二氧化碳，B是氫氣，D是氮氣。

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