Until relatively recently, the vast majority of human being lived and died without ever seeing a city.The first city was probably founded no more than 5，500 years ago.__21__ In fact, nearly everyone lived on farms or in tiny rural (乡村的) .

　　Britain was only the beginning.__22__ The process of urbanization—the migration (迁徙) of people from the r than 40% of Americans lived in urban areas.Today, over 82% of Americans live in cities.Only about 2% live on farms.__23__

　　Large cities were impossible until agriculture became industrialized.Even in advanced agricultural societies, it took about ninety­five people on farms to feed five people in cities.__24__ Until modern times, those living in cities were mainly the ruling elite (精英) and the servants, axing farmers and were limited in size by the amount of surplus food that the rural population produced and by the ability to move this surplus from farm to city.

　　Over the past two centuries, the Industrial Revolution has broken this balance between the city and the country.__25__ Today, instead of needing ninety­five farmers to feed five city people, one American farmer is able to feed more than a hundred non farmers.

　　A．That kept cities very small.

　　B．The rest live in small towns.

　　C．The effects of urban living on people should be considered.

　　D．Soon many other industrial nations became urban societies.

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