Before I talked with ______ scientist, I had never met ______ knowledgeable person like him.

A．a; a

B．the; the

C．the; a

D．a; the

48岁，女性，突然胸闷痛，心悸，心电图示V1～3有深而宽的Q波，ST段抬高，伴有室性早搏、二联律形成，抢救中突然抽搐，最可能的原因是（）

A.Ⅲ度房室传导阻滞

B.心室颤动

C.心脏停搏

D.心房颤动

E.室性心动过速