A.over the past 50 years B.beneath the earth’s surface C.by more than 50 percent D.for more than four decades E

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问题 A.over the past 50 years   
B.beneath the earth’s surface   
C.by more than 50 percent   
D.for more than four decades     
E.as a raw material   
F.for home energy needs  
It is estimated that by 2025 the natural gas demand in the United States will increase______.

选项

答案C

解析 文章第四段最后一句指出,据美国能源信息部预测,到2025年天然气需求将上升50%多。C项by more than 50 percent(50%多)与原句意思相符,故选F。
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