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  3. Prolonging Human Life Prolonging human life has increased the size of the human population. Many people alive today would ha

Prolonging Human Life Prolonging human life has increased the size of the human population. Many people alive today would ha

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问题                         Prolonging Human Life
    Prolonging human life has increased the size of the human population. Many people alive today would have died of childhood diseases if they had been born 100 years ago. Because more people live longer, there are more people around at any given time. In fact, it is a decrease in death rates, not an increase in birthrates, that has led to the population explosion.
    Prolonging human life has also increased the dependency load. In all societies, people who are disabled or too young or too old to work are dependent on the rest of society to provide for them. In hunting and gathering cultures, old people who could not keep up might be left behind to die. In times of famine, infants might be allowed to die because they could not survive if their parents starved, whereas if the parents survived they could have another child. In most contemporary societies, people feel a moral obligation to keep people alive whether they can work or not. We have a great many people today who live past the age at which they want to work or are able to work; we also have rules which require people to retire at a certain age. Unless these people were able to save money for their retirement, somebody else must support them. In the United States many retired people live on social security checks which are so little that they must live in near poverty. Older people have more illness than young or middle-aged people; unless they have wealth or private or government insurance, they must often "go on welfare" if they have a serious illness.
    When older people become senile or too weak and ill to care for themselves, they create grave problems for their families. In the past and in some traditional cultures, they would be cared for at home until they died. Today, with most members of a household working or in school, there is often no one at home who can care for a sick or weak person. To meet this need, a great many nursing homes and convalescent hospitals have been built. These are often profit-making organizations, although some are sponsored by religious and other nonprofit groups. While a few of these institutions are good, most of them are simply "dumping grounds" for the dying in which "care" is given by poorly paid, overworked, and underskilled personnel.
It can be inferred from the passage that in hunting and gathering cultures______.
选项 A、it was a moral responsibility to keep old-aged people alive
B、infants could be left dead in times of starvation
C、parents had to impart the cultural wisdom of the tribe to their children
D、death was considered to be freedom from hardships
答案B
解析 由文章第二段第四句可知，在狩猎与采集时代，遇到饥荒时，幼儿的死亡是可以接受的，因为如果其父母被饿死，幼儿也无法存活下去，B选项符合文意。
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