现有酵母菌甲进行有氧呼吸，酵母菌乙进行发酵，若它们消耗了等量

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现有酵母菌甲进行有氧呼吸，酵母菌乙进行发酵，若它们消耗了等量的葡萄糖，则它们放出的二氧化碳与酵母菌甲吸入的氧气之比为（）

A．3 ：4

B．1 ：2

C．4 ：3

D．2 ：3

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