一名65岁男性患者，进行性吞咽困难3个月，现能进半流食，明显消瘦，乏力，门诊首选检查方法是

A．Exfoliative cytoloSical examination of esopha- gus
B．Barium radiography of esophagus
C．Chest CT examination
D．Esophagoscopy
E．³²p radioactive isotope examination