- Direction:Itisnowgenerallyacceptedthatvehicles(cars,trucks,etc.)areamajorsourceofairpollutionincities.YouraretosuggestonlyONEwaytosolvetheproblem:Onewaytosolvetheproblem.范文:Weallknowthatvehiclesarethemajorsourceofairpollutionincities.Tosolvetheheadach...
- 19158