Unit6词组thesepicturesofourcity我们城市的这些图片maketheairdirty使空气变脏blacksmokefromfactories来自工厂的黑烟messyanddirty又乱又脏keepourcityclean保持我们的城市整洁takethebusandthemetrotoschool乘公共汽车和地铁去学校walktoschool步行去学校movesomefactoriesawayfromourcity从我们的城市搬走一些工厂putrubbishinthebin把垃圾放进垃圾桶plantmoretrees种更多的树helpkeeptheairclean帮助保持空气清洁welldone做得好throwrubbishonthefloor把垃圾扔在地上walkhome步行回家afterschool放学后throwabananaskinontheground把香蕉皮扔在地上gotohospital去医院