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The range of sales of a commodity in the 12 months of 1999 was 240, and the range of sales in the 12 months of 2000 was 320. What is the minimum possible range of sales in the 24 months between 1999 and 2000?
  • A80
  • B240
  • C320
  • D500
  • E560
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正确答案: C

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