The flat rent is expensive, I’ve got about half the space I had at home but I am paying ________ here.

A．at twice much

B．as much twice

C．much as twice

D．twice as much

苍术的主要药理作用是（）

A.调整胃肠运动

B.促进造血

C.兴奋中枢

D.泻下

E.兴奋心脏