My father is usually on _______ duty in his office every _______ few days.

A．the；a

B．/； /

C．/；a

D．a； /

泄泻的最佳治疗原则是（）

A.清热燥湿

B.解表化湿

C.扶肝抑脾

D.运脾化湿

E.温补肾阳