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    【题目】黑河——腾冲线是我国( )

    A.地势第二、三级阶梯分界B.人口地理分界线C.亚热带与暖温带分界 D.内流区与外流区分界线

    【答案】B

    【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。

    中国人口地区分布不均。一般来说，以黑龙江省的黑河云南省的腾冲线为界，东部地区人口多（稠密），西部地区人口少（稀疏）；此线以东人口稠密，面积仅占全国总面积的43%，人口却占全国总人口的94%，此线以西人口稀疏，面积占全国总面积的57%，人口只占总人口的6%；地势第二、三级阶梯分界线为大兴安岭、太行山、巫山、雪峰山；亚热带与暖温带分界为秦岭——淮河一线；内流区与外流区分界线基本与季风区与非季风区的界线吻合。

    故选B。

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