肺动脉高压早期的X线表现是（）
A.双肺纹理增多
B.双肺透亮度增加
C.右下肺动脉主干增宽
D.右心房肥大
E.右心室肥厚、扩张
参考答案：C
活体心血管内血液成分形成固体质块的过程称为
A．白色血栓B．混合血栓C．红色血栓D．透明血栓E．血栓栓塞
The police were seeking more information to find out _____ the rich merchant.
A．who was it that killed
B．who it was that killed
C．it was who killed
D．who was it killed
