I try to eat junk food only once a month _____ I love it.             [ ]

A. through      

B. but          

C. and          

D. although

慢性胃炎的特异性症状是

A．无规律性上腹疼痛

B．上腹饱胀不适，特别在餐后

C．嗳气与泛酸

D．呕吐

E．以上均不是