Some countries have an increasing proportion of population which is under the age of fifteen.What

Some countries have an increasing proportion of population which is under the age of fifteen.What

题目

Some countries have an increasing proportion of population which is under the age of fifteen.What

答案

1、教育体制健全；2、居民社会,文化意识的提高；3、计划生育制度相对完善

举一反三

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