Unit 4Planting trees is good for us,3.12,12th March,is Tree Planting Day,植树节,What should we do,plant trees plnt plnt,种树,What can trees do,air e,空气,Trees can keep the air clean,keep us cool,Trees can keep us cool,place ples,Trees can make the place beautiful,地方,小组讨论：Trees can,Report,Planting trees is good for us. Trees can We should,Trees Planting Day in China is on 12th March. 在中国，植树节是3月12日。 12th March 3月12日,为英语中对具体月，日的表达。 在英语中，月份开头第一个字母必须大写。（日期在前，月份在后,Planting more trees is good for us. 植树对我们有好
