A、Only three days. B、Saturday and Sunday. C、Only one day. D、Throughout the week. D细节题。文章中明确指出在美国，农场主们整个一周都会待在农场里。

(14)All big cities are quite similar. Living in a modern Asian city is not very different from living in an American city. The same cannot be said about living on farms, however.
    (14)In many parts of the world, farmers and their families live in villages or towns.(13)(14)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,(15)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 modern 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.
Questions 13 to 15 are based on the passage you have just heard.
13. What’s the most important difference between farm life in the U.S.A. and in other countries?
14. Which of the following statements is not mentioned in the passage?
15. How long do American farmers stay on their farm?