What _______to go swimming in a river in summer!

A．fun is it

B．funny it is

C．a fun it is

D．fun it is

直接作用于血管平滑肌的降压药不包括

A．米诺地尔

B．肼屈嗪

C．二氮嗪

D．哌唑嗪

E．硝普钠