绞窄性病变引发的腹痛表现不含
A．发展快B．阵发性绞痛C．持续性腹痛阵发性加剧D．易休克E．可有黏液血便
参考答案：B
城市燃气管网系统中，由低压和中压B或低压和中压A两级管网组成的是( )。
A．一级系统B．二级系统C．三级系统D．多级系统
Simon is ______ to make us all ______. [ ]
A. enough funny; laugh
B. enough funny; to laugh
C. funny enough; laugh
D. funny enough; to laugh
