牛膝在天麻钩藤饮中的主要作用是（）
A.活血祛瘀
B.补肝肾，强筋骨
C.利尿通淋
D.引血下行
E.排脓止痛
参考答案：D
在一切监督力量中，党对公安工作的监督具有第一位的意义。 ( )
The feeling of competition among the students in all the classrooms where the test was going on was noticeable to everyone.
A．discord
B．discovery
C．rivalry
D．cooperation
