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What can be inferred from the world population?
What can be inferred from the world population?
admin
2018-06-30
98
问题
What can be inferred from the world population?
In the 20th century the planet’s population doubled twice. It will not double even once in the current century, because birth rates in much of the world have declined steeply. But the number of people over 65 is set to double within just 25 years. This shift in the structure of the population is not as momentous as the expansion that came before. The author Fred Pearce claims it is possible that half of all the humans who have ever been over 65 are alive today. But as a share of the total population, at 8% , it is not that different to what it was a few decades ago. By 2035, however, more than 1. 1 billion people — 13% of the population — will be above the age of 65. This is a natural corollary of the dropping birth rates that are slowing overall population growth; they mean there are proportionally fewer young people around. The "old-age dependency ratio" — the ratio of old people to those of working age — will grow even faster. In 2010 the world had 16 people aged 65 and over for every 100 adults between the ages of 25 and 64, almost the same ratio it had in 1980. By 2035 the UN expects that number to have risen to 26. In rich countries it will be much higher. Japan will have 69 old people for every 100 of working age by 2035 (up from 43 in 2010) , Germany 66 (from 38). Even America, which has a relatively high fertility rate, will see its old-age dependency rate rise by more than 70% , to 44. Developing countries, where today’s ratio is much lower, will not see absolute levels rise that high; but the proportional growth will be higher. Over the same time period the old-age dependency rate in China will more than double from 15 to 36. Latin America will see a shift from 14 to 27.
选项
A、Low birth rate.
B、Slow growth rate.
C、Fast growth of economy.
D、Good social welfare.
答案
A
解析
选项C和D在原文中从未提及。从文中“dropping birth rates that are slowing overall population growth”可以看出,出生率的降低导致社会人口增长缓慢,从而65岁以上老年人的比例增加。因此,根本原因还是出生率的降低。
转载请注明原文地址:https://www.kaotiyun.com/show/sM0O777K
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