2015 수능특강 - 해설강의 1강 1번

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1-1. The health of cities like New York, Los Angeles, and San Francisco represents an astonishing turnaround from the past, when density  too often meant death. Throughout most of human history, proximity enabled the spread of infectious diseases that struck down those humans who had the boldness to risk living near one another. Huge investments in massive waterworks were needed to curb the spread of cholera and yellow fever, just as huge investments in policing were needed to reduce crime in the 1990s. The massing of millions in small land areas requires a vigorous public sector to combat crime and illness. This perhaps explains why people in New York are so much fonder of big governments than people in rural Kansas.