Unit 4Planting trees is good for us,植树对我们是有益的,Tree Plantingplnt Day,植树节,12th March 3月12日,What should we do on the day,plant plnt trees,种树,plant fruit trees,种水果树,What can trees do? 树能做什么,can keep the air clean,Trees,air,空气,hot 热的,cool 凉爽的,keep us cool,使我们保持凉爽,Trees can keep us cool,Place,地方,make the place（地方） beautiful 使这个地方更漂亮,Trees can make the place beautiful,make the school beautiful 使学校更漂亮,make the park beautiful make the zoo beautiful make the home beautiful so, we should plant more trees,1
