【正确答案】It becomes increasingly common for people to see more and more private cars in big cities. It is reported that of all the automobiles in Beijing, private cars account for about 60%. And it is predicted that the number will keep increasing. The result will be what we see in this picture: road accidents, traffic jams, pollution, and drivers' road rage. The steady increase of the ownership of private cars in big cities may be due to its advantages. The greatest advantage of all is that the car gives its owner more convenience and saves them a lot of time, enabling them to go where they want. People can cover long distances by car rapidly and comfortably. Thus, it is possible for them to enjoy the leisure time by making trips to the country or seaside during the two-day weekends and on holidays. In addition, they are no longer forced to rely on public transportation and waste their time in waiting for buses or trains. Furthermore, a private car may keep its owner from harsh weather, thus giving its owner the sense of comfort and security. However, private cars may also cause some problems, for example, traffic jam, pollution, consumption of energy and so on. So, in my opinion, the government should set up some rules to control the ownership of private cars.