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．as a raw mat

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 mat

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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  
When manufacturing many different products，people commonly use natural gas______．
选项
答案E
解析 文章第二段倒数第二句指出，除了家庭取暖外，在美国大部分天然气被作为原材料来生产多种产品，从涂料到服装纤维，到应用于保健、计算机和室内装饰的塑料。E项as a raw material(作为原料)与原句意思相符，故选E。
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