对诊断原发性肝癌具有较高特异性的检查是（）

A.CT

B.B超

C.放射性核素肝扫描

D.血清甲胎蛋白测定

E.选择性肝动脉造影

— That old bridge is ______ safe.

— OK, we can have another access to the village. [      ]

A. none but  

B. anything but    

C. nothing but    

D. something but