白前与前胡都具有的功效是（）
A.宣散风热
B.发散风热
C.祛痰降气
D.祛痰利咽
E.祛痰宽胸
参考答案：C
----Tomorrow is a holiday. Why are you doing your homework?
-----I am doing these exercises now so that I won’t have _____ on Sunday.
A．it
B．them
C．for
D．to
