51. 某英文报社正在举办题为“Green Transportation” 的征文活动。请就此题目写一篇英文短文应征，内容包括：
Everyone has his or her own green transportation. Some like taking public transportation, while others fancy taking a walk to school or work. If you ask me what my green transportation is, my answer would be riding a bicycle. It is to be noted that riding a bicycle is one of the most popular ways to get a round in city. And it has a lot of benefits. This essay will illustrate these benefits as follows.
To keep a green environment in our life, riding a bicycle is the best way. Firstly, riding a bicycle can be faster than taking a bus when there is a traffic jam. Secondly, I can make myself stronger by cycling. Finally, I can make friends who are bicycle lovers and do cycling trip together.
In short, riding a bicycle is the best green transportation. I shall keep up riding a bicycle to get a round in city because its environment-friendly and beneficial to me.