Unit 13Were trying to save the earth!,Section B3 3a-self check,1.停止乘小汽車2.回收紙3.用紙巾4.好好利用5.用垃圾建造房子6.倒置7.經營小生意,stop riding in cars,recycle paper,use paper napkins,put to good use,build a house out of rub