Study skills
Unit 8  A Green World

useful phrases
1 降低空气污染2 节约用水 3 缩短淋浴时间4 回收废弃物 5 过上绿色生活6 砍伐树木7 限制水污染
reduce the air pollutionsave water take shorter showersrecycle wastelive a green lifecut down treeslimit water pollution