六年级上册,Unit4 January is the first month,Lesson 21,Lets sing,Warm-up,Lets review,Warm-up,Presentation,March is the third month of the year,Lets learn,March,What month goes after February,Presentation,In March, people can see green trees and green grass everywhere,Lets learn,Presentation,Tree Planting Day,Look and say,What festival is in March,Presentation,People _ on Tree Planting Day,plant trees,Look and say,Presentation,_ can stop the sand on windy days and make the air clean,Trees,st
