为了防止氧中毒或“氧烧伤”，输氧时间不宜超过（）
A.12h
B.3h
C.5h
D.7h
E.9h
参考答案：A
最可能的诊断为
A．羊水栓塞
B．子痫
C．休克
D．心力衰竭
E．重症肺炎
— My dog's really fat.
— You ________ have given her so much food. [ ]
A. wouldn't
B. can't
C. shouldn't
D. mustn't
