—It smells terrible. What has happened here?

—Look, there is a chemical factory ____waste water___ the river.

A. pour; into            B. pouring; into         C. poured; to

胃癌特殊检查的主要手段有( )。

A．CT

B．X线钡餐检查

C．B超

D．胃液细胞学检查

E．纤维胃镜检查