Liu Xiang’s talent for running and his ability to learn from his experiences________greatly to his many successes in sports.

A．owed

B．contributed

C．devoted

D．related

患者女性，62岁，5天前患前壁心肌梗塞，半小时前突然头晕，心悸，呼吸困难，脉搏细弱，心率110次/分，血压60/50mmHg，心律规则，心音弱无明显杂音，病人发病后10分钟死亡，最可能的死亡原因是：（）

A.心室颤动

B. * * 肌断裂

C.心室膨胀

D.左室游离壁破裂

E.心室间隔破裂