1．America is growing older．For fifty years，only 4 out of every 100 people in the United States were 65 or older．Today，10 out of every 100 Americans are over 65．The aging of the populations will affect aspects of society-education，medicine，housing，and business．The graying of American has made us a very different society-one in which people have quite a different perception （认识） of what kind of behavior is proper at various ages．
An adult's age no longer tells you anything about that person's economic or marital status （婚姻状况），lifestyle，or health．There's no longer a particular year，or even a particular decade，in which one gets married or goes to work or goes to school or has children．The social clock that kept us on time and told us when to get married，to school，get a job，or retire isn't as strong as it used to be．It doesn't surprise us to hear of a 29-year-old university president or a 35-year-old grandmother or a 70-year-old man who has become a father for the first time．Public attitudes are changing．
Many people say，"I am much younger than my mother or my father was at my age．"No one says，"Act your age，"anymore．We've stopped looking with disagreement at older people who act in youthful ways．
13．The best explanation of the expression"acting your age"isB．
A．acting a part of a play when you are old enough
B．doing the things that people expect you of your age to do
C．playing an important role in the society when you are grown up
D．working hard and supporting the family when you are an adult
14．According to the passage，the population in America is getting older，which will affect all of the following exceptB？
A．ho using and business
B．birth rate
C．medicine
D．education
15．Choose the best one to complete the sentence"An adult's age used to tell people something about what person'sD．"
A．schooling and interest
B．family and housing
C．ability to so something
D．health，lifestyle，economic or marital status．
分析 本文主要讲的是美国的老龄化问题．美国正在变老．现在，每100个美国人中有十个人的年龄在65岁以上．人口老龄化将会在教育、医学和经济等许多方面给美国带来影响．人们对某一年龄段应该做什么事情的看法也发生了改变．
解答 13．B 细节理解题．根据文章内容"The social clock that kept us on time and told us when to get married，to school，get a job，or retire isn't as strong as it used to be"社会时钟，使我们及时和告诉我们什么时候结婚，上学，找到工作，或退休是不是那么强，因为它曾经是．故选B．
14．B 细节理解题．根据第一段"The aging of the populations will affect aspects of society-education，medicine，housing，and business．"人口老龄化将影响社会教育、医药、住房和商业等各个方面，可知本题选B．
15．D 细节理解题．根据第二段"细节理解题．"An adult's age no longer tells you anything about that person's economic or marital status （婚姻状况），lifestyle，or health．"一个成年人的年龄不再告诉你关于那个人的任何经济或婚姻状况（婚姻状况）、生活方式、健康．可知本题选D．
点评 本文是社会文化类阅读理解．做这类题材阅读理解时要求考生对文章通读一遍，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据
