The main point of the passage is that the eighteenth and nineteenth centuries were a time when According to the passage, the M

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问题  The main point of the passage is that the eighteenth and nineteenth centuries were a time when
  According to the passage, the Mississippi River was

选项 A、one of the boundaries of a region where new agricultural settlement took place
B、a major source of water for agricultural crops
C、the primary route by which agricultural crops were transported
D、a main source of power for most agricultural machinery

答案A

解析
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