All of      sudden some passengers on_____board let out screams, running upstairs like      crazy.

A．a;/

B．the;the

C．a;the

D．the;/

血浆半衰期最长的强心苷

A．地高辛
B．洋地黄毒苷
C．米力农
D．多巴酚丁胺
E．毒毛花苷K