血府逐瘀汤与生化汤组成中均含有的药物是（）

A.枳实、桔梗

B.枳壳、桔梗

C.桃仁、红花

D.桃仁、川芎

E.桃仁、生地

I really wanted to help those homeless children in the flooded areas, ______ I donated all the pocket money that I had saved for months.

A．so

B．because

C．since

D．for