.Tom is an honest man;I say it,_________ I have been against him.

A．even though

B．as long as

C．as if

D．and yet

食管炎与早期食管癌的鉴别，主要方法是（）

A.胸骨灼痛

B.食管钡透黏膜紊乱

C.脱落细胞检查

D.免疫诊断方法

E.试验治疗