龙胆泻肝汤、普济消毒饮与逍遥散均含有的药物是（）
A.龙胆草
B.陈皮
C.牛蒡子
D.连翘
E.柴胡
参考答案：E
My brother has two ____in his room.
A．pair of glass
B．pairs of glass
C．pair of glasses
D．pairs of glasses
________ you understand this rule, you’ll have no further difficulty.
A．Once
B．Unless
C．As
D．Until
