—Why did you go back to the shop?

—I left my friend_______ there.

A．waiting

B．to wait

C．wait

D．waits

可乐定降压作用的特点是

A．肾血流量减少
B．对消化道溃疡患者不利
C．激动中枢M胆碱能受体
D．降低眼内压，对青光眼患者无禁忌
E．突然停药可出现血压过低