This is a beach America. [ ]
A. about
B. in
C. on
答案：B
It's Mother's Day today, Susan. You are _____ to buy a gift for your mother. [ ]
A. supposed
B. invited
C. planned
病人，22岁。吞咽不畅，胸骨后沉重不适，症状时轻时重，时有呕吐，吐出食管潴留的食物，病史2年，用药症状无缓解，做食管钡剂造影，食管下端呈鸟嘴样狭窄，该病人诊断是（）
A.食管癌
B.食管良性肿瘤
C.贲门失弛缓症
D.食管炎
E.食管憩室
