痛经的主要病机是
A．寒凝血瘀
B．气血运行不畅
C．湿热阻滞
D．阳虚内寒
E．血海空虚
参考答案：B
Don't _____ the milk into the cup. It's full. [ ]
A. peel
B. pour
C. leave
D. put
计算二次积分[*]．
