单选题：Scientistsarepushingknowntechnologiestotheirlimitsinanattemp

题目内容：

Scientistsarepushingknowntechnologiestotheirlimitsinanattemptto________moreenergyfromtheearth. A．extract
B．inject
C．discharge
D．drain

参考答案：

答案解析：

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