【单选题】【消耗次数：1】
当今世界和平与发展这两大问题一个都没有得到解决，是由于：
①
战争与革命仍然是当今世界的主题
②
人口增长失控，环境恶化
③
民族问题和宗教问题引起的战争时起时伏
④
霸权主义和强权政治仍然存在
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