The world's population growth rate rose from about 1.5 percent per year during 1950-1951 to over 2 percent in the early 1960s. Although the growth rate thereafter started to fall due to(由于) people getting married later as well as the development of technology, the rate is on the rise ...
Why has population growth been dropping since the 1960s? A variety of explanations factor into this, including: Falling fertility rates: Birth rates tend to fall as nations get richer. First, this happened in the developed world, but as the century progresses this phenomenon will impact more an...
The world's population first reached one billion people in 1803, and reach eight billion in 2023, and will peak at almost 11 billion by the end of the century. Although it took thousands of years to reach one billion people, it did so at the beginning of a phenomenon known as the demo...
I. 2009. "Trends of Population Ageing from 1950-2050: A Comparative Study Between Bangladesh and World". Pakistan Journal of Social Sciences, 6(1): 6-10. Pakistan.K.M. Mustafizur Rahman , Muntasir Ibn Mohsin and Ismail Tareque, Trends of Population Ageing from 1950-2050: A Comparative ...
The world's population is ageing: virtually every country in the world is experiencing growth in the number and proportion of older persons in their population. Population ageing is poised to become one of the most significant social transformations of the twenty-first century, with implications ...
People won’t be able to survive on Earth, so they will have to find a new planet to live on.The pessimistic scientists have predicted that the population in 2100 will() A. be greatly decreased B. remain unchanged C. be greatly increased D. probably double ...
By 2050 the world's population is projected to rise to 9 billion from just over 7 billion currently . Proponents of genetically modified foods say they are safe and can boost harvests even in bad conditions by protecting against pests weeds and drought . This they argue will...
B. The world population has greatly increased. C. There has been a sharp rise in life expectancy. D. Aging has become a problem for many countries.( )2. Why are people living longer? A. People are becoming wealthier. B. Many babies have been born since 2000. C. There have been ...
A. The world population has greatly increased. B. There has been a sharp rise in life expectancy. C. There are more developed countries in the world. D. Ageing has become a problem for many countries.29. Why are people living longer according to the passage? A. People are becoming ...
15.It's already tens of years___the world's population reached five billion.( ) A.beforeB.afterC.since 试题答案 在线课程 分析自从世界人口达到50亿已经几十年了. 解答答案:C; 根据设空处前面的It's already tens of years,联系语境可以推测句意是"自从世界人口达到50亿已经几十年了."表示"自从...