2. 外语
  3. 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

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  
Natural gas is recognized as the most economical energy source______．
选项
答案F
解析 文章第二段第四句指出，实际上，天然气是家庭能源需求中最经济的能源，是电能的三分之一。F项for home energy needs(家庭能源需求)与原句意思相符，故选F。
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