槐花散的功用有（）
A.祛湿排脓
B.清热解毒
C.行气解郁
D.疏风下气
E.解表散邪
参考答案：D
解析：槐花散功用：清肠止血，疏风下气。
_______ their service, the workers of the hotel are active in learning English.
A．Improving
B．To improve
C．Improve
D．Having improved
已知等差数列{an}的前n项和为Sn，若a4=18-a5，则S8=[ ]
A.54
B.68
C.72
D.90
