题目内容：
Concerning the sustainability of geothermal energy, people believe that_______
A．the geothermal energy can be exploited for indefinite period of time in one place B．the geothermal energy has an advantage over the solar and wind energy
C．only geothermal energy exploited by binary power plants can last longer
D．in certain places the geothermal energy may be dried up finally after decades of exploitation
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