空气质量的高低，与空气中所含的_______的数量有关，可以用_______来表示。
污染物；污染指数
患者疼痛时的行为反应是（）
A.面色苍白或潮红
B.呼吸频率增加
C.手心出汗
D.胃肠功能紊乱
E.皱眉、咬嘴唇
It is reasonable to assume that demand for sophisticated emergency medical treatment is higher in Jerusalem, where terrorist bomb attacks were frequent incidents.
