Make Our Cities btter
　　Many things have been done and great progress has been made in makeing our cities better and more beautifu in recent years.Many trees have been planted and much care has been taken of the planted trees.
　　We can benefit much from making our cities greener.First,trees absorb carbon dioxide which is harmful,but produce oxygen which is essential to human beings.Secondly,with trees all around,our cities will look more beautiful.Thirdly,trees can improve the climate of the cities,making it neither too hot in summer nor too cold in winter.
　　Since we can get so much benefit from making our cities better,we should spare no effort to do so.We should plant even more trees and take even better care of them while they are growing.Besides,we should not cut down trees any more.In a word,we should do everything to add to the greenization of our cities.