根据内容回答题。
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, 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
第1题
根据下面短文内容,回答题。
Public Relations
__________ 查看材料
A.matter
B.form
C.system
D.direction
第2题
根据下面短文内容,回答题。
Teaching and Learning
_____________ 查看材料
A.careful
B.happy
C.familiar
D.pleased
第3题
根据下面短文内容,回答题。
Child Consultants
____________ 查看材料
A.sentence
B.word
C.answer
D.question
第6题
根据下面内容,回答题:
A.JP
B.USP
C.BP
D.Ch.P.
E.Ph.Eur.
美国药典的缩写是
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第7题
根据下面内容,回答题
A.pizr
B.Draft
C.DMFS
D.Dmfs
E.meanDM
乳牙龋失补牙数
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第8题
根据下面短文内容,回答题。
The Race into Space
Dennis Tito was the first tourist in space. 查看材料
A.Right
B.Wrong
C.Not mentioned
第9题
根据下面内容,回答题
2006年该省进出口总额约为()亿美元。 查看材料
A.5270.1 6
B.6340
C.3068.99
D.2201.16
第10题
根据下面内容,回答题:
农村居民人均纯收入超过5000元在哪一年? 查看材料
A.2007年
B.2008年
C.2009年
D.2010年
第11题
根据下列内容,回答题。
A.IgG
B.IgA(分泌型)
C.IgM
D.IgD
E.IgE
黏膜局部抗感染作用的抗体是
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