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The reason that the diffusion rate of CO2 through the respiratory membrane is faster than that of O2 is
A、CO2 is diffused by active transport.
B、CO2 is diffused by facilitated transport.
C、difference of partial pressure of CO2 is higher than that of O2.
D、molecular weight of CO2 is higher than O2.
E、solubility of CO2 in water is higher than that of O2.
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