It is clear that if we read English article every day, we________improve our English.[ ]

A. are bounded to  

B. are bound to

C. bound  

D. bound to

急性上消化道出血，首选的器械检查是（）

A.X线钡餐

B.胃镜检查

C.腹部超声

D.腹部CT

E.选择性动脉造影