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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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A.1,870 billion
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B.2,080 billion
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C.2,470 billion
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D.2,680 billion
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E.2,850billion
D显示答案
