阅读下面短文，根据其内容写一篇60词左右的内容概要。
While contact between adolescents(between the ages of fifteen and nineteen) and their peers(同龄人) is universal characteristic of all cultures， the nature and the degree of such contact vary a great deal. In American contemporary society adolescents spend much more time with their peers than with younger children 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 workplace separated children from adults， with adults working and children attending school. The dramatic increase of mothers in the workplace has further contributed to the reduction in the amount of time adolescents spend with adults.
School reform efforts during the nineteenth century， which resulted in age-segregated schools and grades， have reduced the amount of time adolescents spend with younger children.
Finally， the changes in population are considered a factor that may have contributed to the emergence of adolescent peer culture. From 1955 to 1975， the adolescent population increased dramatically， from 11 percent to 20 percent. This increase in the number of adolescents might be a contributing factor to the increase in adolescent peer culture in terms of growth in size as well as in terms of its impact on society's other cultures(adults， younger children).
Research supports the view that adolescents spend a great deal of time with their peers. Reed Larson and his colleagues examined adolescents’daily activities and found that they spend more time talking to their friends than engaging in any other activity. In typical week， high school students will spend twice as much time with their peers as with adults. This gradual withdrawal from adults begins in early adolescence. In sixth grade， adults excluding parents account for only 25 percent of adolescent social networks. Another important characteristic of adolescent peer culture is its increasingly autonomous(自治的) function. While childhood peer groups are conducted under the close supervision of parents， adolescent peer groups typically make an effort to escape adult supervision and usually succeed in doing so.
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假设你是李华，你打算利用假期出国旅游。请你就此给你的美国笔友 Michael发一封电子邮件，谈论你出国旅游的原因，并邀请Michael有时间来中国。要点如下：
1.出国旅游很有意义；
2.开阔眼界，了解国外的风俗和历史；
3.和来自不同文化背景的人交朋友，学习外语
4.放松身心，欣赏美景
注意：1.词数80左右(信的开头和结尾已给出，不计入总词数)；
2.可以适当增加细节，以使行文连贯。
Dear Michael.
How are you？ These days， I am planning to travel abroad during the vacation.
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Yours truly，
Li Hua
翻译句子并连成一篇80词左右的短文(画线部分用本单元词汇或句式表达)
1.暑假即将来临，我打算去云南旅游，香格里拉是我的第一个旅游目的地。
2.一想到云南美丽的风景，我都有些迫不及待地想要立即出发。
3.成群的牛羊和马儿在绿色的草原上徜徉，周边的森林则是鸟类和其他动物的家园。白雪皑皑的山顶构成了一幅美丽的图画，美得让你无法用语言形容。
4.我多么盼望能尽快看到这些美景啊！
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根据提示将下列句子进行升级训练
1.The local people didn't know the secret until the under- ground treasure was unearthed.(把 until从句提到句首，用倒装结构)
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2.Someone requested that a return ticket(should) be booked right away.(用 It is requested that句式)
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3.What should we consider before we decide to travel abroad？(用短语take...into consideration替换动词 consider)
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4.Living with host families gives them the chance to learn more about the new culture. In the families there may be other college students.(用非限制性定语从句把两个简单句合并为一个复合句)
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5.I came to live and study in a completely strange city for the first time.(用It is the first time改写该句)
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6.It is more meaningful to try getting around the world， but not to say meaningless words.(用 instead of改写该句)
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根据所给出的词汇写出相应的高级写作词汇
1.________ hope to do
2.________ want to do
3.________ plan to do
4.________ right away
5.________ be known as
6.________ can't be expressed in words
写出下列写作常用词汇
1.________ n.经济；节约
2.________ n.雕塑；雕像
3.________ n.景象；视野；视力
4.________ n.看法；景色；视野 v.看；考虑
5.________ v.宁可；更喜欢
6.________ n.财富；金银财宝 v.珍爱；重视
7.________ n.要求；请求 v.要求；请求
