____ new cure for this disease that medical experts have recently developed proves to be ______ most effective, although it can not completely kill all the viruses.

A．A; a

B．The; /

C．/; the

D．A; the

强心苷减慢心房纤颤患者的心室频率是由于（）

A.抑制心房中的异位节律点

B.使心房率降低

C.使心房肌不应期延长

D.降低浦肯野纤维的自律性

E.抑制房室传导