坐骨棘间径为
A．骨盆入口横径线B．骨盆入口前后径线C．中骨盆前后径线D．中骨盆横径线E．骨盆出口平面横径
参考答案：D
关于Dandy-Walker综合征，正确的是
A．Dandy-Walker综合征是一种特殊类型的脑畸形
B．典型的Dandy-Walker综合征以小脑蚓部缺失、第四脑室扩张和颅后窝池扩张为特征
C．Dandy-Walker综合征越典型，预后不良的可能性越大
D．Dandy-Walker综合征越典型，预后不良的可能性越小
E．常伴有心脏畸形和手足畸形
Alice, your parents were really anxious about you. You ______ home without a word. [ ]
A. mustn't leave
B. needn't leave
C. couldn't have left
D. shouldn't have left
