既能凉血止血，又能活血散瘀的药物有（）。

A.大蓟

B.赤芍

C.白茅根

D.地榆

E.茜草

He’s only too ready to help others, seldom, _____ refusing them when they turn to him.  

A．if ever

B．if never

C．if not

D．if any