The yield of natural gas from Norway's Troll gas field is expected to increase annually until the year 2005 and then to stabilize at six billion cubic feet a day, which will allow such an extraction rate at least for 50 years' production.
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A2005 and then to stabilize at six billion cubic feet a day, which will allow such an extraction rate at least for
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B2005 and then to stabilize at six billion cubic feet a day, an extraction rate that will allow at least
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C2005 and then stabilizing at six billion cubic feet a day, with such an extraction rate at the least allowing
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D2005, then stabilizing at six billion cubic feet a day, allowing such an extraction rate for at least
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E2005, then stabilizing at six billion cubic feet a day, which will allow such an extraction rate for at least
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正确答案: B