空气浴
参考答案：
利用气温和体表温度之间的差异形成刺激，气温越低作用时间越长，刺激强度就越大，可促进新陈代谢，健壮呼吸器官和增强心脏活动。
一个多边形的每个外角都等于10°，则它有______条对角线．
We didn't have enough chairs, _____ some of the students had to sit on the floor. [ ]
A. or
B. as
C. so
D. but
