引起急性肾衰的常见原因（）。
A.肾后性
B.肾间质性
C.肾前性
D.肾血管性
E.肾性
参考答案：A, C, E
Though I was tired out that evening, I _____ from falling asleep by the great pain in my knee.
A．was prevented
B．had prevented
C．has prevented
D．am prevented
封闭性脓肿厌氧标本收集方法是（）
A.针管抽取
B.后穹隆穿刺抽取
C.肺穿刺术
D.胸腔穿刺术
E.膀胱穿刺术
