Prolonging human life has decreased the dependency load. In all societies ___1___
people are disable or too young or too old to work are dependent on the ___2___
rest of society to provide them. In hunting and gathering cultures old people ___3___
who could keep up might be left behind and die. In times of famine infants ___4___
might be allowed to die because they could not survive when their parents
starved; whereas when their parents survived they could have another child.
In most contemporary societies people feel it a obligation to keep people
live whether or not they can work. There are a great many people who live ___5___
the past age in which they want to work or are able to work; there are rules ___6___
that require people to retire at a certain age. If these people are able to save ___7___
money from their retirement, somebody else must support them. In the Unite
states many people live on social security checks, which are so considerable ___8___
that they must live in near poverty.
Elder people are more liable to become ill than young or middle-aged people; ___9___
therefore they are wealthy or provided with private or government insurance, ___10___
they must often “go on welfare” if they fall seriously ill.


1. decreased -> increased

2. people后加who或that
分析句子结构,此句出现了两个谓语(系动词)are,故有一个必是从句。根据句子的主干可知,前部分are disable or too young or too old to work应该是定语从句,且缺少了引导词,又因为先行词是people,故加上相应的引导词that或who。

3. provide后加for
此处从句的意思是“没有工作能力的人由有工作能力的人来养活”。provide for sb是“养活某人”的意思。

4. could后加not

5. live -> alive
这里是词组keep sb alive。

6. in -> at
此处的意思是“今天还有很多人超过了能够工作的年龄…..”。定语从句的先行词是age,复原后的词组是at the age。故用at which。

7. If -> Unless

8. considerable -> little

9. Elder -> Older

10. therefore -> unless