具有镇静安神、平肝潜阳、收敛固涩功效的药物是（）
A.石决明
B.夏枯草
C.龙骨
D.朱砂
E.菊花
参考答案：C
22. The girl often helps her best friend, ______ is not good at English. To their delight, his English is improving day by day.
A．which
B．who
C．what
D．where
简述中共市委的领导作用。
