For each individual, sport is ___ possible source for inner improvement. Olympism seeks to create a way of life based on ___ joy found in effort.        

A．a; a

B．the; the

C．a; the

D．the; a

肾脏调节酸碱平衡作用不准确的是

A．近端小管排泄H⁺

B．近端小管重吸收HCO₃^-

C．远端小管和集合管Na⁺-K⁺交换

D．远端小管排泄氨

E．远端小管和集合管Na⁺-H⁺交换