C

     There are many festivals at our school. This month is October. In October there is a sports festival. We have the volleyball game and the basketball game during(在……期间) the festival. On October 15th，there is an English festival. On that day we have an English speech contest(演讲比赛)．On October 19th，we have a school trip. We go to Beijing with the teachers. On the last day of this month，there is a music festival. On that day we can enjoy beautiful music. It's really wonderful. Next month，there is an art festival. Students often display(展示) their pictures on that day.

①这种不爱护公物应该受到批评。

②她喜欢一个人在平静的环境里看书。

③上课时，同学们都全神贯注、聚精会神地听讲。

④我们班取得了竞赛第一名，大家的心里露出了胜利的喜悦。

把抛物线y=-x²向左平移1个单位，然后向上平移3个单位，则平移后抛物线的解析式为（　　）

读最佳人口规模示意图，回答下列各题。