I think it__________that she should be knowledgeable about computers for her present job.[ ]

A．urgent  

B．normal

C．essential 

D．gifted

质量控制成分为总黄酮醇苷和萜类内酯的中药是（）

A.槐花

B.银杏叶

C.黄芩

D.黄芪

E.葛根