The industrial societies have been extremely productive during the last 3 centuries. The (36)______________advance has been remarkable. During this relatively short period of time, greater changes in people’s living conditions have (37) __________than in the thousands of years which (38)__________ them. Form about 8000 B.C., when the (39) __________ era of human race began, to 1776 A.D., the beginning of the American Revolution, people grew hardly any richer at all. The Americans of 1776 used th

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