虎杖的功效是（）
A.利胆退黄
B.利尿通淋
C.清热解毒
D.活血祛瘀
E.祛痰止咳
参考答案：A, C, D, E
适于管理自主呼吸的Mapleson系统回路是（）。
A.A回路
B.B回路
C.C回路
D.D回路
E.F回路
Look! That's a computer game and________ an English computer game. [ ]
A. this is
B. it's
C. he's
D. that's
