Which of the following statements shows the tremendous growth of American economy between the end of the Civil War and 1900?

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问题 Which of the following statements shows the tremendous growth of American economy between the end of the Civil War and 1900?

选项 A、Steam and electricity replaced human muscle.
B、Machines and oil were used.
C、Steal took the place of iron; people and goods could be moved by railroads.
D、All of the above.

答案D

解析
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