首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
What is making the world so much older? There are two long-term causes and a temporary blip that will continue to show up in the
What is making the world so much older? There are two long-term causes and a temporary blip that will continue to show up in the
admin
2015-12-28
43
问题
What is making the world so much older? There are two long-term causes and a temporary blip that will continue to show up in the figures for the next few decades.【F1】
The first of the big causes is that people everywhere are living far longer than they used to, and this trend started with the industrial revolution and has been slowly gathering pace.
In 1900 average life expectancy at birth for the world as a whole was only around 30 years, and in rich countries under 50. The figures now are 67 and 78 respectively, and still rising. For all the talk about the coming old-age crisis, that is surely something to be grateful for-especially since older people these days also seem to remain healthy, fit and active for much longer.
【F2】
A second, and bigger, cause of the ageing of societies is that people everywhere are having far fewer children, so the younger age groups are much too small to counterbalance the growing number of older people.
This trend emerged later than the one for longer lives, first in developed countries and now in poor countries too. In the early 1970s women across the world were still, on average, having 4.3 children each. The current global average is 2.6, and in rich countries only 1.6.【F3】
The UN predicts that by 2050 the global figure will have dropped to just two, so by mid-century the world’s population will begin to level out.
The numbers in some developed countries have already started shrinking. Depending on your point of view, that may or may not be a good thing, but it will certainly turn the world into a different place.
The temporary blip that has magnified the effects of lower fertility and greater longevity is the baby-boom that arrived in most rich countries after the Second World War.【F4】
The timing varied slightly from place to place, but in America—where the effect was strongest—it covered roughly the 20 years from 1945, a period when nearly 80 million Americans were born.
The first of them are now coming up to retirement. For the next 20 years those baby-boomers will be swelling the ranks of pensioners, which will lead to a rapid drop in the working population all over the rich world.
As always, the averages mask considerable diversity.【F5】
Most developing countries do not have to worry about ageing—yet, in the longer term, however, the same factors as in the rich world—fewer births, longer lives—will cause poorer countries to age too.
【F5】
选项
答案
目前,大多数发展中国家还不用担心老龄化的问题——然而,从更长远来看,和富国一样,日益下降的出生率和人类寿命的延长等因素同样也将使发展中国家面临老龄化问题。
解析
转载请注明原文地址:https://kaotiyun.com/show/iGsZ777K
0
考研英语一
相关试题推荐
InatimeoflowacademicachievementbychildrenintheUnitedStates,manyAmericansareturningtoJapan,acountryofhigha
Drinkingwaterandwaterfordomesticuseoftencomefromgroundwater.Inordertoprotectthiswater,localwaterauthoritiesc
Sevenyearsago,whenIwasvisitingGermany,Imetwithanofficialwhoexplainedtomethatthecountryhadaperfectsolution
Sevenyearsago,whenIwasvisitingGermany,Imetwithanofficialwhoexplainedtomethatthecountryhadaperfectsolution
Thepercentageofimmigrants(includingthoseunlawfullypresent)intheUnitedStateshasbeencreepingupwardforyears.At12.6
AnearthquakehitKashmironOct.8,2005.Ittooksome75000lives,【C1】______130000andleftnearly3.5millionwithoutfood
探究科研领域的发展趋势——1996年英译汉及详解Thedifferencesinrelativegrowthofvariousareasofscientificresearchhaveseveralcauses.【F1】Som
Youprobablyhavealongmentallistofmomentsandfactsyouwishyoucouldremember—butactuallyyoucannot.Thegoodnews,【B1
Sciencefictionhasatendencytobecomesciencefact.SomethinglikeHal,theon-boardspaceshipcomputercapableofethicalde
HowtheUnitedStatesbecamethemostprosperoussocietyintheworldhasalwaysbeensuchahotspotissue.Certainlong-standin
随机试题
确诊伤寒最有力的依据是()
下列不属于“元曲四大家”的是()
A.肾小球微小病变B.系膜增生性IgA肾小球肾炎C.膜性肾病D.毛细血管内增生性肾小球肾炎E.系膜毛细血管性肾小球肾炎
1.背景某项目经理部在负责某本地网线路一期工程施工时,与其运营商在各方面配合得都非常好,因此运营商希望该项目经理部帮助其完成一个存在较多质量问题的直埋光缆线路工程的整改工作,要求将其整改成一个合格工程。该直埋光缆线路工程存在的问题主要有:部分地段
建筑管道系统的试验类型主要分为()等试验。
埋地燃气管道,当设计输气压力为1.0MPa时,其气密性试验压力为()。
成本预算的编制方法中,()预算是指在按年分月编制预算的情况下,随着一个时期的过去,连续补充编制另一个时期,逐期向后滚动,并调整各期预算的过程。
将如图旋律片段改写成一首欢快的圆舞曲。要求:(1)符合圆舞曲体裁特征,可增减音符(包括休止符)、改变节奏。(2)在改写后的乐谱上标注速度、力度标记。
儿童已经明白成人不在视野范围内后还会继续出现,所以他们以母亲为安全保障.在新环境中探索、冒险,然后又回来寻求保护。此时幼儿的依恋属于()
下面哪种破译类型的破译难度最大?()
最新回复
(
0
)