48.AsfarasI'mconcerned,ridingbicyclesisagoodsolutiontoairpollution. 就我个人而言,骑自行车是一个解决空气污染的好办法。 asfaras…beconcerned就……而言;关于 asolutionto……的解决办法 49.Litteringmakesourschooldirty,anddoesharmtotheimageofourschool.乱...