My sister is only four years old, but she can look after ________ now.

A．she

B．her

C．hers

D．herself

女性，48岁，吞咽不适半年，最可能的诊断为（）

A.食管癌

B.食道静脉曲张

C.食管憩室

D.食道贲门失迟缓综合征

E.食管狭窄