China is called the kingdom of bicycles because it has the largest number of bicycles in the world. The bicycle is the most popular transportation tool in China . Wherever you go, you can see many people riding on bikes to go to work, school , do shopping, or visit friends. During the rush hour, you may see a boiling sea of bikes in all directions. Compared with cars, bikes have many advantages. First, they are very handy and convenient. With a bike, you can go anywhere you like, and you needn’t look for a large parking place in a crowded town. By riding bikes, you can avoid traffic jams and thus save the time. Second, they are not very expensive, and almost every family can afford them. Third, they do not cause air or sound pollution. Besides, riding bikes regularly does good to your health. In modern times, people areusually too busy to have any time for physical exercise. Riding bikes serves as a good way to keep yourself strong and healthy. However, bicycles also have some disadvantages. For example, they make streets crowded and are likely to cause traffic accidents. In rainy or snowy weather, riding bikes may be difficult, and fall from them may result in injury. But despite the disadvantages, the bicycle is still very useful, convenient and necessary means of transportation in China. And I do believe it will still be so in future.