食管异物最好发部位为（）
A.食管入口
B.主动脉弓压迹
C.左支气管压迹
D.膈肌裂孔处
E.贲门
参考答案：A
The woman's illness ________ all the doctors in this hospital; they couldn't find the cause.[ ]
A. prevented
B. puzzled
C. exhausted
D. consulted
