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【答案】 81．答案：younger children and adults 根据Changes in the workplace separated children from adults 和which resulted in age-segregated schools and grades，have reduced the amount of time adolescents spend with younger children 可推断应填younger children and adults．82．答案：school reform efforts and the changes in population 根据School reform efforts during the nineteenth century 和the changes in population are considered a factor可推断应填 school reform efforts and the changes in population． 83．答案：In early adolescence 根据This gradual withdrawal from adults begins in early adolescence 可推断应填In early adolescence．84．答案：They have less close supervision of parents．/They manage to escape adult supervision．/They are increasingly autonomous．根据adolescent peer groups typically make an effort to escape adult supervision 可推断应填They have less close supervision of parents．/They manage to escape adult supervision．/They are increasingly autonomous．