【正确答案】A: In the picture we can see there are so many cars and buses stuck on the road. Traffic jam is very common in big cities such as Beijing and Shanghai, especially in the rush hour. As people's life standard improves, private cars become very popular. People regard them as a symbol of wealth and status. But does it really increase people's welfare? It is hard to say. If you are stuck on the road for two hours a day, how can you say it is a kind of enjoyment of life? Furthermore, the increase of private cars has a very bad effect on environment. The greenhouse effect and the acid rain are both closely related to the air pollution. Therefore, private cars should not be encouraged in our society. B: I completely agree with Candidate A. Traffic jam has already become more and more severe in big cities. A lot of people spend more than three hours on the road to and from work, and at /east half an hour is wasted on waiting in the traffic jam. It is really annoying.