听力原文：W: What is the most common means of transport for Chinese people nowadays? M: To most Chinese people, the most common means of transport is the bus. W: Does the railway have less of an influence now than previously on their lives? M: Yes. Now people can travel by car, or by plane, not like before, when they had to depend on the railway. W: As far as I know, many residents in big cities are very interested in purchasing personal cars. Have these cars increased or reduced the burden of city transport? M: More and more cars have added to the burden of city transport, because they take up a lot of road space otherwise available to public transport. W: Does the government encourage or curb the purchase of personal cars? M: Now the government neither encourages nor curbs the purchase of personal cars, but I think there will be a policy in the future to curb the purchase. Have you traveled much in China, Linda? W: No, not much, but I travel quite a lot in Shanghai every day. M: Do you think Shanghai transport is efficient? W: Yes, I do. I think the Shanghai Underground is marvelous. I always travel by tube because it's fast and comfortable. (23)