The fact that most Americans live in urban areas does not mean that they res

游客2025-01-24 16

问题 The fact that most Americans live in urban areas does not mean that they reside in the center of large cities. In fact, more Americans live in the suburbs of large metropolitan areas than in the cities themselves.
The Bureau of the Census regards any area with more than 2,500 people as an urban area, and does not consider boundaries of cities and suburbs.
According to the Bureau, the political boundaries are less significant than the social and economic relationships and the transportation and communication systems that integrate a locale. The term used by the Bureau for an integrated metropolis is an MSA, which stands for Metropolitan Statistical Area. In general, an MSA is any area that contains a city and its surrounding suburbs and has a total population of 50,000 or more.
At the present time, the Bureau reports more than 280 MSAs, which together account for 75 percent of the US population. In addition, the Bureau recognizes 18 megapolises, that is, continuous adjacent metropolitan areas. One of the most obvious megapolises includes a chain of hundreds of cities and suburbs across 10 states on the East Coast from Massachusetts to Virginia, including Boston, New York, and Washington, D.C. In the Eastern Corridor, as it is called, a population of 45 million inhabitants is concentrated. Another megapolis that is growing rapidly is the California coast from San Francisco through Los Angeles to San Diego. [br] Why does the author mention the Eastern Corridor and the California coast in Paragraph 4?

选项 A、As examples of megapolises.
B、Because 75 percent of the population lives there.
C、To conclude the passage.
D、The Bureau of the Census is located there.

答案 A

解析根据第四段的the Bureau reports more than 280 MSAs， which together account for 75 percent of the US population，即75%的人住在MSA，但不单是the Eastern Corridor，California coast地区，因而排除B。第四段是对megapolis的介绍，不是对文章的总结，排除C。选项D的内容没有在文中提到。

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