导致肺动脉高压最常见的原因是（）
A.肺栓塞
B.右心衰竭
C.先天性心脏病
D.肺结核
E.慢性阻塞性肺疾病
参考答案：E
常可引起DIC的是（）。
A.扩散因子
B.荚膜
C.外毒素
D.内毒素
E.杀白细胞素
It was ________ was a waste land ten years ago _______ a modern city has been set up on.[ ]
A. which; where
B. where; that
C. what; that
D. that; which
