After he became conscious, he remembered ______ and_____ on the head with a rod.

A．to attack; hit

B．to be attacked; to be hit

C．attacking; hitting

D．having been attacked; hit

普萘洛尔治疗心绞痛时可产生的不利作用是（）

A.心收缩力增加，心率减慢

B.心室容积增大，射血时间延长，增加氧耗

C.心室容积缩小，射血时间缩短，降低氧耗

D.扩张冠脉，增加心肌血供

E.扩张动脉，降低后负荷