单项选择题
某地一段时间内，某暴露人群发生某病新病例的频率称为()
单项选择题 被动物咬伤后，清洗伤口、接种疫苗属于什么预防()
单项选择题 He is so lazy that he will never ._____anything.
单项选择题 You don't need to_____ people of their mistakes all the time.
