人口素质的高低越来越取决于 A平坦的地形、适宜的气候等自然因素

人口素质的高低越来越取决于

A平坦的地形、适宜的气候等自然因素

B人类本身的遗传因素已经起到很大影响

C社会经济因素

D人们良好的生态环境、生活水平和方式

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人口素质的高低越来越取决于 A平坦的地形、适宜的气候等自然因素

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