题目内容
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题目材料:
If the total number of ton-miles that were transported increased at a constant rate from 1941 to 1991 approximately what was the total number of ton-miles that were transported in 1986?
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A1,870 billion
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B2,080 billion
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C2,470 billion
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D2,680 billion
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E2,850billion
D显示答案