阅读理解FightwithpollutionHundredsofyearsago,lifewashardert...
问题详情：阅读理解FightwithpollutionHundredsofyearsago,lifewasharderthanitistoday.Peopledidn’thavemodernmachines.Therewasnomodernmedicine,either.Lifetodayhasbroughtnewproblems.Oneofthebiggestispollutio...