______used to be the center of exchange for the goods of hunters and trappers? ______began to have a flood of new permanent set

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问题 ______used to be the center of exchange for the goods of hunters and trappers?
______began to have a flood of new permanent settlers since the arrival of a steamboat?

选项 A、 
B、 
C、 
D、 

答案C

解析 题句信息对应于"St. Louis"部分的最后一句:...the arrival of the steamboat...marked the beginning of a flood of new permanent settlers。
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