单选题
Freight costs were reduced to 10% of what they had been because of ______.
A、
the decline in taxes
B、
the construction of the railroads
C、
the construction of the Erie Canal
D、
the development of industry
【正确答案】
C
【答案解析】
[解析] 由第六段前两句话The canal produced an immediate effect．Freight costs were cut to about onetenth of what they had been可知。
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