当a=4，b=0.5时，0.9a-0.2b=[ ]
A．2.6
B．3.5
C．2.5
答案：B
— Where does a teacher work? — . [ ]
A. In a hotel
B. In a school
C. In a store
具有解表除烦功效的药物是（）
A.桑叶
B.菊花
C.柴胡
D.淡豆豉
E.升麻
