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질문 내용 : Cities in Westren Europe tend to be economically healthy compared with their suburbs. By contrast, in the United States, cheap gas, massive highway investment, policies that favor construction on the edge of cities, and heavy reliance on property taxes to fund public shcools have encouraged much more car-reliant and spread-out urban ares, where eight in ten Americans now live.

위문장에서 where가 가리키는 것은 spread-out urban areas가 맞지요? 또 이것은 다른말로 the edga of cities라고 보아도 무방하지요?^^