人教版九年级下册英语Unit 13 We're trying to save the earth! Section A grammar focus 课件.ppt
Unit 13Were trying to save the earth!,Section A 3 Grammar Focus,Revision,不同种类的污染2.河底3.把垃圾扔到河里4.在中起作用,different kinds of pollution,the bottom of the river,throw rubbish into the river,play a part in,I