e:
1．城市绿化的现状；
2．绿化的好处(如：清新空气，美化城市，改善气候……等等)；
3．怎样才能实现绿化。
your composition should be no less than 100 words. write this composition on the composition sheet. remember to write it clearly.
make our cities greener
many things have been done and great progress has been made in the greenization of our cities in recent years. many trees have been planted and much care has been taken of the planted trees. but, in spite of all this, greenization in the cities in china is far from satisfactory compared with cities in other countries in the world. for example, the green space for every people in shanghai is only 2 square meters while that of the people in london exceeds 20 square meters.
we can benefit much from the greenization of our cities. first, trees absorb carbon dioxide which is harmful, but produce oxygen which is essential to human beings. secondly, with trees all around, our cities