3、ds1ProcedureLead-inRevision.LetSstoreviewthewordphrasesthatlearnedbefore.Step1ShowSssomeinterestingthingsthatmadeofwasteandaskthemtothinkabout:Whataretheymadeof?Step2Freetalk.1.Which rubbish can be recycled?2.How do you dealt with your rubbishin everyday life?Step3AskSstoreadthepass