It’s necessary for human beings to breath _______ and plants can produce it.
A．CO2B．H2C．O2D．N2
C
根據(jù)常識對于人類而言呼吸氧氣是必要的，植物能產(chǎn)生氧氣，故選C。A是二氧化碳，B是氫氣，D是氮氣。
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