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    精英家教网 > 初中英语 > 题目详情
    It’s necessary for human beings to breath _______ and plants can produce it.
    A．CO2B．H2C．O2D．N2
    C
    根据常识对于人类而言呼吸氧气是必要的，植物能产生氧气，故选C。A是二氧化碳，B是氢气，D是氮气。
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