患者男，60岁。患慢性支气管炎、阻塞性肺气肿合并阻塞性肺疾病10余年，近两天因天气突然变化，患者出现咳嗽、咳痰、气喘等症状。入院查体：呼吸30次／分，SaO₂为88%。血气分析结果为PaO₂为50mmHg，PCO₂为60mmHg。

该患者吸氧流量宜为（）

A.1～2L／min

B.2～4L／min

C.4～6L／min

D.6～8L／min

E.8～10L／min

—What are you going to do next year?      

—______.      [ ]

A. I was thinking of it      

B. I have decided to be a singer      

C. I studied in Peking University      

D. I'm not sure. Maybe I will study abroad