[单项选择]Most inhabitants of cities earn their income by the provision of goods and services to other inhabitants of the same city, so they frequently fail to realize that in the final analysis every city is dependent for its survival on the world beyond its boundaries. This is true not only in the obvious sense that commodities must be supplied from outside the city to feed and clothe the urban population and fuel its machinery, but also in the more fundamental sense that a city exists in a particular location only because that site enables it to serve the economic and political needs of areas outside the city.
Geographers and economists categorize as "basic enterprises" those enterprises which produce goods or perform services largely for sale outside the city. A factory producing cars would be a basic enterprise, but one producing bottled drinks for the local market would be not. The ratio of workers in basic enterprises to workers serving the internal markets of the city itself is de
A. support.
B. survive.
C. suspend.
D. circulat

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