填空题.A few years ago, it was fashionable to speak of a generation gap, a division between young people and their elders. Parents complained that their children did not show them proper respect and obedience, while children complained that their parents did not 41 them at all. What had gone wrong? Why had the generation gap 42 appeared? Actually, the generation gap has been around for a long time. Many critics argue that it is built into the fabric of our society. One important cause of the generation gap is the 43 that young people have to choose their own lifestyles. In more traditional societies, when children grow up, they are expected to live in the 44 area as their parents, to marry people that their parents know and approve of, and often to continue the family occupation. In our society, young people often 45 great distances for their education, move out of the family home at an early age, marry—or live with—people whom their parents have never 46 , and choose occupations different from those of their parents. In our modern society, parents often expect their children to do better than they did: to find better jobs, to make more money, and to do all the things that they were 47 to do. But often they discover that they have very little in 48 with each other. The speed at which changes take place in our society is another cause of the gap between the generations. In a traditional culture, elderly people are valued for their 49 , but in our society the knowledge of a lifetime may become 50 overnight. The young and the old seem to live in two very different worlds, separated by different skills and abilities. A. fortune B. supported C. wisdom D. unable E. display F. travel G. absolutely H. opportunity I. same J. suddenly K. common L. met M. understand N. stale O. explain