Unit 7 Protect the Earth同步练习一、英汉互译。1.节约能源 ______________________ 2.浪费水______________________3.砍伐树木 ______________________ 4.保护地球______________________5.收集塑料瓶____________________ 6.使用纸袋和玻璃杯______________________7. make a poster___________________ 8. use too much plastic bag...