Which of the following can be the best title for the passage? Freight costs were reduced to 10% of what they had been because o

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问题 Which of the following can be the best title for the passage?
Freight costs were reduced to 10% of what they had been because of

选项 A、the decline in taxes.
B、the construction of the railroads.
C、the construction of the Erie Canal.
D、the development of industry.

答案C

解析 第六段第一、二句话:The canal produced an immediate effect. Freight costs were cut to about one-tenth of what they had been。
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