In many countries, people prefer to travel by car, while in our country, bikes are the most popular form of transportation. Since we live in a developing country, the car production is not as much as that of the developed countries. And most people can ’ t afford to buy a car. So, we prefer bikes as a tool of traveling. First, a bike is much cheaper than a car, so most customers can afford it. If there ’ s something wrong with a bike,people can fix it or have it fixed easily without much money. The second reason is that bikes need much less parking space than cars. In narrow roads, it is very difficult to park cars. However, a bike needs relatively less room, so it is very convenient for us to use bikes. The third reason for using a bike is that it can save energy. In this case, a bike is a very good kind of transportation tool, for it needs no gasoline at all. Therefore, in our country, traveling by bike is very popular. But with the economic development, the day when we use cars as the most popular form of transportation is sure to come.