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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, oht 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 contempo- rary 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 eared for at home until they died. Today, with most members of a household working or in school, there is often no one at borne 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 under-skilled personnel.
The writer believes that the population explosion results from 查看材料

A. an increase in birthrates
B. the industrial development
C. a decrease in death rates
D. cultural advances

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材料题请点击右侧查看材料问题 查看材料

A. exercise
B. abuse
C. labor
D. strength

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Musical Chairs
Do you know how to play a game called Musical Chairs" ? It is easy to play and most people enjoy it. All you need are some chairs, some people and some way of making music. You may use a piano or any other musical instrument, if someone can play it. You may use a tape recorder. You can even use a radio.
Put the chairs in a row. The chairs may be put in twos, back to back. A better way is to have the chairs in one row with each chair facing in the opposite direction to the chair next to it.
The game is easy. When the music starts ,the players walk round the chairs. Everyone goes in the same direction, of course, they should walk in time to the music. If the music is fast they should walk quickly. If the music is slow, they should walk slowly.
The person playing music cannot see the people in the game. When the music stops, the play- ers try to sit on the chairs. If a person cannot find a chair to sit on, he drops out. Then, before the music starts again,one chair must be taken away. When the music stops again, one more player will be out.
At last,there will be two players and one chair. The one who sits on the chair when the music stops is the winner.
If ten people are playing musical chairs, you must begin with 查看材料

A. nine chairs
B. ten chairs
C. eleven chairs
D. one chair

油脂污染和天然存在的有害物质中有致甲状腺肿作用的物质是()。

A. 黄曲霉毒素
B. 棉酚
C. 芥酸
D. 芥子甙
E. 多环芳烃类化合物

材料题请点击右侧查看材料问题 查看材料

A. who
B. where.
C. when
D. which

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