下述哪些为急性肺损伤的危险因素（）
A.心肺复苏时大量输液
B.胃食管反流、误吸
C.溺水
D.体外循环
E.肺挫伤
参考答案：A, B, C, D, E
维生素B2缺乏的典型症状为______。
A．神经管畸形 B．皮肤和牙龈出血C．皮肤干燥 D．唇炎和口角炎E．腹泻
The first paragraph of this passage tells us about ______.
A．the rhythms of brain waves
B．the daily activities of sleep
C．the stages of sleep in cycles
D．the daily activities in cycles
