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    【题目】我国生育政策三年内从“单独二胎”到“全面放开二孩”的变化，主要原因是

    A.育龄妇女人数少B.人口负增长

    C.人口老龄化D.生育观念的改变

    【答案】C

    【解析】

    根据中华人民共和国成立后，由于人民生活水平的提高和医疗卫生条件的改善，人口死亡率大幅度下降，中国人口快速增长。根据2010年全国第六次人口普查结果，中国总人口为13.7亿，约占世界人口总数的1/5，是世界上人口最多的国家，进行分析解答。

    20世纪70年代以来，我国实行了计划生育，在控制人口数量方面取得巨大成就，但同时也出现劳动力减少、社会养老负担加重，人口老龄化等问题。2013年11月15日，中央决定放开“单独二胎”生育政策。2015年10月29日党的十八届五中全会决定：坚持计划生育的基本国策，完善人口发展战略，全面实施一对夫妇可生育两个孩子政策，其目的就是为应对当前出现的人口问题，逐步调整完善现行的生育政策，促进人口长期均衡发展；结合题意。故选：C。

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