The main point of the passage is that the eighteenth and nineteenth centuries were a time when The author mentions "wheat and

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问题  The main point of the passage is that the eighteenth and nineteenth centuries were a time when
  The author mentions "wheat and wheat flour" in line 22 in order to

选项 A、show that Americans exported more agricultural products than they imported.
B、show the increase in the amount of wheat products exported.
C、demonstrate the importance of cotton among American export products.
D、demonstrate that wheat farming was becoming more profitable.

答案C

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