单元词句梳理Section A（Grammar Focus-4c）Were trying to save the earth!Unit 13必背单词 1.afford v.承担得起；买得起 _承担得起做某事2.reusable adj.可重复使用的；可再次使用的3.transportation n.运输业；交通运输afford to do sth.必背短语 4._参加5._关掉6._付费；付出代价7._采取行动take part in turn off pay for take action 必背句子 8._the biggest clean-up project this city has ever had.它被认为是这个城市曾经有过的最大的清洁工程。It was considered
