我国是第一自行车大国，使用自行车有很多的好处。但随着经济的发展，越来越多的家庭购买了小汽车。请根基这些情况写一篇英语文章，阐述一下自行车和汽车各自的优缺点，并谈谈自己的看法。
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China has the largest number of bicycles. Bicycles are still popular all over the world because of their outstanding advantages. Its convenient to go to school or go to work by bike. It can help people keep healthy to ride often. However, with the development of economy, more and more people buy cars. The exhaust gas from cars pollutes the air. More and more cars have brought heavy traffic problems. I prefer riding bicycles because it is cheap and keeps the air clean.
中国有最多数量的自行车。自行车在世界上仍很流行，因为它们的优点是。上学或骑自行车去上班很方便。它可以帮助人们保持健康，骑经常。然而，随着经济的发展，越来越多的人购买汽车。汽车的尾气污染空气。越来越多的汽车带来了交通拥挤的问题。我更喜欢骑自行车，因为它很便宜，而且保持空气清洁。