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    【题目】地球环境人口容量一直是学者讨论的话题，下列关于环境人口容量的叙述正确的是

    A．总人口数量是制约环境人口容量的首要因素

    B．世界人口总量已超过环境人口容量

    C．我国的人口合理容量应控制在16亿左右

    D．环境人口容量具有不确定性

    【答案】D

    【解析】

    试题分析：环境人口容量是指在可预见的时期内，利用本地资源及其他资源和智力、技术条件，在保证符合社会文化准则的物质生活水平条件下，一个国家或地区所能持续供养的人口数。影响环境人口容量的首要因素是资源状况，A错。当人口超过环境人口容量，生态系统就会遭到破坏而失去平衡，并最终失去原来的承载力，所以B选项错误。我国的人口合理容量控制在8—9亿，人口合理容量是按照合理的生活方式，保障健康的生活水平，同时又不妨碍未来人口生活质量的前提下，一个国家或地区最适宜的人口数量，因此C也错误。环境人口容量具有确定性和不确定性，所以D正确。故选D。

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