请英语阅读能力好的指点！America is growing older. Fifty years ago, only 4 out of every 100 people i

第54题
America is growing older. Fifty years ago, 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 population will affect American society in many ways -- education, medicine, and business. Quietly, the graying of America has made us a very different society -- one in which people have a quite different idea of what kind of behavior is suitable at various ages.
A person's age no longer tells you anything about his/her social position, marriage or health. There's no longer a particular year in which one goes to school or goes to work or gets married or starts a family. The social clock that kept us on time and told us when to go to school, get a job, or stop working 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 ideas 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" any more. We've stopped looking with surprise at older people who act in youthful ways.
1．阅读理解

The population of 65 years old and over today is _____ times as many as that of fifty years ago.

A、4

B、10

C、100

D、2.5

2．阅读理解

It can be learnt from the text that the aging of the population in America ______.

A、has made people feel younger

B、has changed people's social position

C、has changed people's understanding of age

D、has slowed down the country's social development

3．阅读理解

The underlined word "one" refers to______.

A、a society

B、America

C、a place

D、population

4．阅读理解

"Act your age" means people should ______.

A、be active when they are old

B、do the right thing at the right age

C、show respect for their parents young or old

D、take more physical exercise suitable to their age
5．阅读理解

If a 25-year-old man becomes general manager of a big firm, the writer of the text would mostprobably consider it ______.

A、normal

B、 wonderful

C、unbelievable

D、unreasonable

1.D before 4 out of every 100 now 10 out of every 100
2.C
3. A one in which people have a quite different idea of what kind of behavior is suitable at various ages,是这句的one吗？
4.B
5.A 从 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.可推断

1-4  caba 1.   主旨题。根据第一、二段的最后一句及第三段可判断。 2.   细节题。one是a society的同位语且后面跟了一个定语从句，可以通过分析句子结构得出正确答案。 3.   细节题。全文最后一句话给出了提示。 4.   推理题。可仔细阅读第二段中倒数第二句话。

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