（课件4）We're trying to save the earth

Unit 13 We're trying to save the earth! sectionA-4a-4d(共30张PPT)

Unit 13 We're trying to save the earth! 重点知识复习课件（共28张PPT）

Unit 13 We're trying to save the earth SectionA 2d-3a课件（32张PPT）

Unit 13 We're trying to save the earth Section B 3a-Self Check课件（30张PPT)

Unit 13 We're trying to save the earth! SectionB整合课件(共28张PPT)

Unit 13 We're trying to save the earth Section A (GF-4c)课件+素材（26张PPT)