消化性溃疡最常见的并发症为().
A.穿孔
B.出血
C.幽门梗阻
D.癌变
E.瘘管形成
参考答案:B
解析:出血是消化性溃疡的最常见并发症,也是上消化道出血最常见原因。
学习和公共生活需要规则,但经济活动不需要规则。[ ]
__ people waited for help, _ the situation became.[ ]
A. The more, the worse
B. The long, the bad
C. The longer, the more dangerous