下列除哪组药外都具有疏散风热明目的作用（）
A.桑叶、菊花
B.蝉衣、蔓荆子
C.木贼、薄荷
D.谷精草、刺蒺藜
E.夏枯草、密蒙花
参考答案：C
Many important leaders of different countries______ in the opening ceremony of the 29th Olympics held on August 8,2008.
A．turned up
B．turned down
C．turned on
D．turned over
队列是一种对进队列、出队列操作的次序做了限制的线性表。
