2. 外语
  3. The most important features in the growth of the American economy in the early 20th century were______.

The most important features in the growth of the American economy in the early 20th century were______.

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问题 The most important features in the growth of the American economy in the early 20th century were______.
选项 A、the use of steam and electricity as chief energy, the use of machines and the development of railway
B、the appearance of airplane, the use of electricity on a large scale and urbanization
C、the development of large corporations, urbanization and the application in production of new technology
D、the development of industry and large cities, the expansion of railroad network
答案C
解析
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