单选题：Geothermal resources, wind turbines, and hydropower faciliti

题目分类：理工类
题目类型：单选题
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题目内容：

Geothermal resources, wind turbines, and hydropower facilities in Paragraph 4 cited as examples to illustrate that_______. A．the amount of alternative energy production from public lands is huge
B．alternative energy production is no less than conventional energy production
C．they are the most typical conventional energy resources from public lands
D．geothermal resources are more important than the other two

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