— We are afraid we can't finish the task ________ a month.

— Take your time, but next month you'll have a new one.[      ]

A. within  

B. by

C. among  

D. after

下列情况下不宜进行钡餐检查的是（）

A.急性胃炎

B.胃、十二指肠溃疡

C.胰腺炎

D.胃肠穿孔

E.肠结核