哪项不是子宫收缩乏力的常见原因（）
A.子宫壁过度膨胀
B.头盆不称
C.精神过度紧张
D.内分泌失调
E.使用小剂量镇静药
参考答案：E
—Alice looks blue today.
—Yes，I asked her，but she wouldn't say ______ troubled her.
A．why was it that
B．that was why
C．it was what
D．what it was that
简析阿Q 性格的基本特征。
