一运动员正在进行长跑锻炼，从他的大腿肌细胞中检测到3种化学物质，其浓度变化如下图所示。图中P、Q、R三曲线依次代表[]A．O2、CO2、乳酸B．乳酸、CO2、O2C．CO2、O2、乳酸D．CO-高一生

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