黄连在朱砂安神丸的作用（）。
A.清热解毒
B.清心泻火
C.泻火解毒
D.清热燥湿
E.清热安神
参考答案：B
— Are you still busy?
— Yes, I ____ my homework, and it won't take long. [ ]
A. just finish
B. am just finishing
C. have just finished
D. am just going to finish
室内给水系统水泵串联的目的是（）
A、增加扬程，流量不变
B、减少流量
C、增加流量
D、减少扬程
