Go straight and          left. The hospital is next to the post office.[ ]

A. turn                    

B. take              

C. go                      

D. come

慢性Ⅱ型呼吸衰竭患者治疗，给氧的原则是（）

A.高浓度高流量间断给氧

B.低浓度低流量间断给氧

C.早期呼吸机辅助呼吸

D.高浓度低流量持续给氧

E.低浓度低流量持续给氧