American cities are similar to other cities around the world. In every country, cities reflect the【B1】of the culture. Cities contain the very best aspects of a society: opportunities for education,【B2】, welfare, and entertainment. They also【B3】the very worst parts of a society: violent crime, racial【B4】, and poverty. American cities are changing, just【B5】American society. After World War Ⅱ, the【B6】of most large American cities decreased【B7】, the population in many Sun Belt cities increased. Los Angeles and Houston are cities【B8】population increased. These population shifts to and from the city reflect the changing values of American society. During this time, in the【B9】1940s and early 1950s, city residents became wealthier, more prosperous. They had mare children. They needed more【B10】. They moved out of their apartments in the city to buy their own homes. They bought houses in the【B11】, areas near a city where people live. These are areas without many offices or factories. Now things are changing. The children of the people who【B12】the cities in the 1950s are now【B13】. They, unlike their parents, want to live in the cities.【B14】continue to move to cities in the Sun Belt. Cities are【B15】and the population is increasing in【B16】states as Texas, Florida, and California. Others are moving to more【B17】cities of the Northeast and Midwest, such as Boston, Baltimore and Chicago. Many young professionals, doctors, lawyers, and executives are moving back into the city. They prefer the city【B18】the suburbs because their jobs are there they are afraid of the fuel shortage or they just【B19】the excitement and opportunities which the city offers. A new class is moving into the cities—a wealthier,【B20】mobile class. 【B1】