早期食管癌的X线表现是

A.长的不规则线状狭窄

B.食管黏膜呈珠状改变

C.贲门部呈光滑鸟嘴状狭窄

D.外压狭窄，黏膜光滑完整

E.黏膜呈局限性管壁僵硬