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B．能源和人类利益有着双重关系。人类历史发展长河中，由于利用能源成本低廉，人们主要关注能源和人类安康关系中有利的一面。然而，过去一百年以来
人口以空前速度增长，引起了能源需求的激增，同时，人均工业能源需求亦急剧
增长。因此，能源利用所需成本越来越高，无论是外延成本还是内涵成本。一方
面，能源资源加速减少，能源供应所需投入越来越高；另一方面，相比之下，
外延成本更加令人忧虑，原因是能源利用严重威胁大众健康和安全，不断破坏全
球生态系统，并可能引发大规模军事冲突。
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B在感恩节的周末，24小时内发生了2起车祸，撞死3人，使得过去2周里斯普林菲尔德城市道路上死亡人数上升到6人。本年度还剩下最后1个月，在斯普林菲尔德至少有17r