Unit 3
- care for关爱; 照料earth地球pick采; 摘pick flowers摘花cut down砍伐;把.....砍倒dirty脏的make the air dirty污染空气waste浪费drive驾驶; 开 ( 车 )drive a car开车
- more更多的have to必须;不得不World Car Free Day世界无车日something某事; 某物think想; 认为also也; 同样thing东西; 事物only只; 仅仅