胃癌的癌前期病变包括
A．胃息肉
B．胃溃疡
C．胃酸缺乏症
D．萎缩性胃炎
E．应激性溃疡
参考答案：A,B,C,D
By the time he realizes he _____ into a trap, it'll be too late for him to do anything about it. [ ]
A. walks
B. walked
C. had walked
D. has walked
属于收入证明的是（）。
A、银行代发工资明细
B、近3个月的个人所得税纳税证明
C、单位劳资或人事部门出具的收入或职级证明原件
D、审查获得的社会保障基金帐户缴纳情况
