[单项选择]　　　 Industrialization came to the United State after 1790 as North American entrepreneurs 　　　 increased productivity by reorganizing work and building factories. These innovations 　　　 in manufacturing boosted output and living standards to an unprecedented extent; the 　　　 average per capita wealth increased by nearly 1 percent per year―30 percent over (5) the course of a generation. Goods that had once been luxury items became part of 　　　 everyday life. 　　　 The impressive gain in output stemmed primarily from the way in which workers made 　　　 goods, since the 1790’’s, North American entrepreneurs―even without technological 　　　 improvements―had broadened the scope of the outwork system that mace manufacturing (10) more efficient by distributing materials to a succession of workers who each performed a 　　　 single step of the production process. For example, during the 1820’’s and 1830’’s the shoe 　　　 industry greatly expanded the scale and extend of me outwork s
A. It become easier for factory’’ owners to find workers and customers.
B. Manufacturers had to employ more highly skilled workers.
C. The amount of power required for factories operate was reduced.
D. Factories could operate more than one engine at a time.

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