低流量供氧，氧流量为1L/min时吸氧的浓度为（）
A、25%
B、29%
C、33%
D、37%
参考答案：A
40. When I was very young, I thought that inside the radio ______ who liked talking very much.
A．a group of people lived
B．a group of people did live
C．did a group of people live
D．lived a group of people
四逆散所治四肢厥逆的病机是（）
A.血虚寒客经脉
B.肾阳衰微，阴寒内盛
C.传经寒邪，深陷于里
D.过汗亡阳
E.以上都不是
