With the development of industry and extension of railroad network in the early 20th century in the U.S.A., there appeared ______.
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With the development of industry and extension of railroad network in the early 20th century in the U.S.A., there appeared ______.
A.a rapid growth of cities
B.an influx of foreign goods
C.an increase of urban ghettos
D.a great increase in the number of farms
正确答案A
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