It ______ be the postman at the door. It's only six o'clock.         [ ]

A. mustn't    

B. can't        

C. won't      

D. needn't

关于腹痛部位的描述，错误的是（）

A.急性胃炎的疼痛在剑突下

B.阑尾炎的疼痛在脐周

C.胆石症的疼痛在右上腹

D.急性胃肠穿孔腹痛部位弥漫

E.小肠疾病的疼痛多在脐周