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A. Reasons for Having Large Families in Some Countries.
B. Calculation of Population Growth.
C. Efforts Made to Lower the Mortality Rate (死亡率)
D. High Fertility Rates in Developing Countries.
E. Low Fertility Rates in Developed Countries.
F. Birth Control Programs.
1. _____
     Population growth is determined by the relationship between births and deaths.The growth rate is
calculated by the birth rate minus the death rate.If the birth rate is 4%, for example, and the death rate
is 3%, the population growing at rate of 1% per year.
2._____
     Historically, families had many children, but average life expectancies are low and many children died
young.Improvements in nutrition and public health programs in the past 30 years have led to a drop in
the mortality rate and hence to more rapid population growth.
3._____
     Public health programs and improved nutrition over the past 30 years have brought about declines in
mortality rates in the developing nations.But fertility rates (出生率) have not declined as quickly, and the
result has been high rates of population growth.Reduced population growth depends to some extent on
decreased birth rates.
4._____
     Family planning and modern forms of birth control are important mechanisms for decreasing fertility,
but by themselves such programs have had rather limited success in most countries where they have been
tried.If family planning strategies are to be successful, they must make sense to the people who are
supposed to benefit from them.
5. _____
     To a great extent, in developing countries people want large families because they believe they need
them.In some societies, children are important sources of farm labor, and they may thus make significant
contributions to household income.In societies without any social security programs for the aged, children may also provide a vital source of income for their old parents.
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