The most important features in the growth of American economy in

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 thedevelopment 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
【正确答案】：B
【题目解析】：本题考查20世纪初美国的经济。20世纪初美国经济增长的最重要特征是大公司的发展、城市化和新技术生产中的就业。