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American Cities
American cities are similar to other cities around the world. In every country, cities reflect the values of the culture. Cities contain the very best aspect of a society opportunities for education, employment and entertainment. They also contain the very worst parts of a society., violent crime, racial conflict and poverty. American cities are changing, just as (46) . After world War II, the population of most large American cities decreased; however, the population in many Sun belt cities increased. Los Angeles and Houston are cities (47) . These population shifts to and from the city reflect the changing values of American society. During this time, in the late 1940s and early 1950s. city residents became wealthier, more prosperous. They had more children They needed more space. They moved out of their apartments in the city to buy their own homes. They bought houses in the suburbs, (48) . These are areas without many offices or factories. During the1950s the American "dream" was to have a house on the outskirts. Now things are changing. The children of the people who left the cities in the 1950s are now adults. They, (49) ,want to live in the cities. Some Continue to move to cities in the Sun belt. Cities are expanding and the population is increasing in such states as Texas, Florida and California. Others are moving to more established 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 to the suburbs because their jobs are there; they are afraid of the fuel shortage; or they just enjoy the excitement and opportunities which the city offers. A new class is moving into the cities a wealthier, (50) .
A. American society
B. areas near a city where people live
C. where population increased
D. like their parents
E. unlike their parents
F. more mobile class
46．正确答案是：A。根据上文给出的信息，城市能够反映出一个社会的情况，此处说美国 的城市在变化，这说明美国的社会也在变化，因此just as后引导的是省略谓语的句子。
47．正确答案是：C。本句意思是：洛杉矶和休斯顿是两个人口有所增长的城市，where引导的从句作地点状语。
48．正确答案是：B。选项B．areas near a city where people live在句子结构中作同位语，解释说明suburbs。
49．正确答案是：E。从语法上看，本句主语是they，谓语是want，因此所填部分是插入语， 不能影响句子结构。根据上文所说now things are changing，可判断出这一代和上辈的不同，如选D．1ike their parents则意思不符。
50．正确答案是：F。本句说的是城市新兴阶级的两大特点：更富有，更活跃。所以这里用比较级与前面的wealthier搭配
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