肾后性肾衰竭的原因（）
A.休克
B.双侧输尿管结石
C.X线造影剂
D.转移性肝癌
E.骨盆骨折
参考答案：B
下列不属于里克特提出的管理方式的是（）
A.专制-权威式
B.开明-权威式
C.群体参与式
D.权变领导式
Though there is no one in the hall, he stands on the stage as if he ____watched and expected to deliver a speech.
A．has been
B．had been
C．were being
D．is being
