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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
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