下列哪项不是盐炙的作用

A．滋阴降火

B．补肝肾

C．泻热利尿

D．温中补气

E．引药下行

The best way to get a serious point ____ without causing offense is ____ humour.  

A．across; with

B．out; within

C．across; in

D．down; by