【正确答案】 C

【答案解析】[听力原文]
   All big cities are quite similar. Living in a modem Asian city is not very different from living in an American city. The same cannot be said about living on farms, however.
   In many parts of the world, farmers and their families live in villages or towns. In the United States, however, each farm family lives on its own fields, often beyond the sight of any neighbors. Instead of traveling from a village to the fields every morning, American farmers stay on their land throughout the week.
   Of course life keeps changing for everyone, including farmers. Today there are cars, good roads, radios and television sets. And of course there are modem machines for farming. All of these have changed farm life.
   For many years, however, farming in America was often a lonely way of living. Farmers had to deal with their own problems, instead of getting help from others. They learned to try new methods, and to trust their own ideas instead of following old ways.
   What's the most important difference between farm life in the U.S.A. and in other countries?
细节题。原文中提到美国的农场主与其他国家的不同之处在于农户们都住在自己的农场里，邻里之间都相隔很远；而其他国家的农户大多住在村子或者镇上。