便血合并皮肤黄染、蜘蛛痣及肝掌，首先考虑（）
A.结肠癌
B.胃底食管静脉破裂出血
C.消化性溃疡
D.急性胆囊炎
E.胃癌
参考答案：B
______ the two buildings there lies a swimming pool in which a lot of people areswimming. You can find Peter ______ them.[ ]
A. Among; between
B. Between; between
C. Among; among
D. Between; among
总线制模式报警系统的优点是可根据报警控制器的输入端口辨别探测器所连接的防区端口。
