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The most important features in the growth of American economy in the early 20th cenruty were（）
A:the use of steam and electricity as chief energy,the development of lare corporation and the development of railway
B:the development of large corporation,urbanization and the employment in production of new technology
C:the appearance of airplane,the use of electricity on a large scale and urbanization
D:the rapid development of industry,railway and large cities

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出自：00522《英语国家概况》

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