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问题 选择题

目前，发达国家和发展中国家都在全球寻求资源的最佳配置，这使全球生产体系出现混合型多层次分工的结构（如下图）。回答1~2题。

1、上图模式中，法国所占据的位置主要依靠本国的 [ ]

A、原料

B、技术

C、市场

D、政策

2、上图模式中，美国为世界性跨国生产提供初级产品，其主要得益于 [ ]

A、耕地面积广大

B、生产成本低

C、区域专业化生产

D、劳动力素质高

答案

1、B

2、C

单项选择题

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 U.S. 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.

According to the Bureau of the Census, what is an urban area

A．A chain of adjacent cities.

B．An area with at least 50,000 people.

C．The 18 largest cities.

D．An area with 2,500 people or mor
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填空题

对于一个放大器来说，一般希望其输入电阻（）些，以减轻信号源的负担，输出电阻小些，以增大带动负载的能力。
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