题目

Until late in the 20th century, most Americans spent time with people of generations. Now mid-aged Americans may not keep in touch with old people until they are old themselves. That’s because we group people by age. We put our three-year-olds together in day-care center, our 13-year-olds in school and sports activities, and our 80-year-olds in senior-citizen homes. Why?     We live away from the old for many reasons: young people sometimes avoid the old to get rid of fears for aging and dying. It is much harder to watch someone we love disappear before our eyes. Sometimes it’s s习作园地。题目：______________给我带来了快乐要求：1、先把题目补充完整，在横线上填上合适的词语。2、要有中心，有条理，内容具体，语句通顺，能表达出自己的真情实感，不少于450字。3、文中不出现真实的姓名。