Although the United States cherishes the tradition that it is a nation of small towns and wide open spaces, only one in every eight Americans now lives on a farm. The recent population trend has been a double one, toward both urbanization and suburbanization. Metropolitan areas had grown explosively in the past decade, and nearly half this increase has been in the suburbs. With the rapid growth of cities has come equally rapid decentralization. The flight of Americans from the central city to the suburbs constituted one of the greatest migrations of modern times; quiet residential sections outside cities have become conglomerations (密集) of streets, split-level houses, and shopping centers.
This spurt of suburban expansion, however, does not alter tile basic fact that the United States has become one of the most urban nations on the face of the earth. Census (人口调查) Bureau figures show that the rural population has been shrinking steadily since 1830. When the United States
A. few people live on farms
B. the nation consists mainly of small towns and wide open spaces
C. the population is the greatest in the world
D. the United States is a nation of big cities
Although the United States has been shaped by continual waves of immigrants, Americans have often viewed immigration as a problem. Established Americans often look down on new immigrants. Despite such tensions, economic needs have always forced Americans to seek immigrants as laborers and settlers, and economic opportunities have appealed to foreigners. The vast majority of immigrants to the United States have come in search of jobs and the chance to create a better life for themselves and their families.
In all of American history, less than 10 percent of immigrants have come for political or religious reasons.
Economic immigrants from Europe, Asia, and Latin America have come to the United States voluntarily. Others, most African Americans, were involuntarily transported to North America to do forced labor or to be sold as slaves. Regardless of the reasons they come to the United States, new immigrants typically work in labor-intensive, low-paying, and dangerous
A. for political reasons
B. for religious reasons
C. for economic reasons
D. for belief reasons
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