肾淤血呈暗红色，切开时，从切面流出多量暗红色液体，多见于（）
A.左心衰竭
B.右心衰竭
C.肝硬化
D.肺气肿
E.纤维素性肺炎
参考答案：B
To my great joy．I got a chance to take a photo with Andy after the vocal concert, which I _____forward to for years．
A．have been looking
B．had been looking
C．looked
D．had looked
采用简单随机抽样，从含有8个个体的总体中抽取一个容量为4的样本，个体a前三次未被抽到，第四次被抽到的概率为 ．
