----Do you know where coffee was from first?

----It was said that coffee ______in Africa a long, long time ago.

A．discovered

B．invented

C．was invented

D．was discovered

门静脉栓塞声像图特点是（）

①门静脉内边缘不光滑的低回声或中等回声

②阻塞部门静脉管腔增宽

③阻塞部门静脉管腔变窄或闭塞

④部分梗阻门静脉内血流变细不规则，狭窄部血流速度增快

⑤阻塞段门静脉内无血流信号，周围有时可见小侧支血流及背离肝脏逆向血流

⑥阻塞段门静脉内无血流信号，周围有时可见小侧支血流及向肝血流

A.①②④⑤

B.①③④⑥

C.①③④⑤

D.①②④⑥