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Contact between adolescents (between the ages of 15 and 19) and their peers (同龄人) is a universal characteristic of all cultures. However, the nature and the degree of such contact ________ a great deal. In American contemporary society, adolescents spend much more time with their peers than with ________ or adults.

This pattern of age segregation (隔离) in American society did not become usual until the beginning of the industrialized society. Changes in the ________separated children from adults, with adults working and children attending school. The dramatic increase of mothers in the workplace has ________ contributed to (促成) the reduction in the amount of time adolescents spend with adults. School reform efforts during the nineteenth century, which ________ age-segregated schools and grades, have reduced the amount of time adolescents spend with younger children. Finally, the changes in population are considered a(n)________that may have contributed to the emergence of adolescent peer culture. From 1955 to 1975, the adolescent ________ increased dramatically, from 11 percent to 20.9 percent. This increase in the number of adolescents might be a contributing factor to the ________ in adolescent peer culture in terms of growth in size as well as in terms of its impact on society’s other cultures.

Research ________ the view that adolescent s spend a great deal of time with their peers. Reed Larson and his colleagues examined adolescents’ daily ________ and found that they spend more time talking to their friends than engaging in any other activity. In a typical week, ________, high school students will spend twice as much time with their peers as with adults. This gradual withdrawal (退出) from adults begins in ________ adolescence. In sixth grade, adults (excluding parents) account for only 25 percent of adolescent social ________ . Another important characteristic of adolescent peer________ is its increasingly autonomous (自治的) function. While childhood peer groups are conducted under the close supervision (监管) of parents, adolescent peer groups typically make an effort to ________ adult supervision and usually succeed in doing so.