题目

A boy was born to a couple after eleven years of marriage. They were a loving couple and loved the boy very much. When the boy was around two years old, one morning the husband saw a medicine bottle open. He was late for work so he asked the wife to cap the bottle and keep it in the cupboard. The mother, preoccupied in the kitchen, totally forgot the matter. The boy saw the bottle and playfully went to the bottle and, fascinated with its color, drank it all. It happened to be a poisonous medicine meant for adults in small dosages. When the child collapsed, the mother hurried him to the hospit我国划分温度带的主要指标是（　　）A．≥10℃的活动积温B．年平均气温C．7月平均气温D．1月平均气温