Part B Directions: You will hear four dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each question by choosing A, B, C or D. After listening, you will have 10 seconds to check your answer to each question. You will hear each piece ONLY ONCE. 听力原文： Going for a walk, whether in towns or in the country, is just not part of the American idea. An English journalist who was just walking along the road in Los Angeles was questioned by the police, because it seemed so strange that he should be doing this. Except in town centers, it is rare to find any sidewalk beside a road and some suburban roads are so bad that cars have to travel very slowly, too slowly to be dangerous to children. A person who tries to walk at night may find not only that he is almost hurting his feet on the uneven surface, but also that there are no street lights (the headlights of cars being good enough for the motorist) and that he will be pursued by angry dogs from the houses among which he is passing. The dogs are so unaccustomed to seeing anybody walking that, like the Los Angeles police, they think he must be trying to do something evil. According to the passage, which of the following is uncommon in the US?