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
68
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.
【F4】
选项
答案
婴儿潮出现的时间因地点的不同而略有差别,但在美国,始于1945年的婴儿潮大约持续了20年。这一时期出生的人口数量接近8000万。对美国社会造成极大影响。
解析
转载请注明原文地址:https://kaotiyun.com/show/aGsZ777K
0
考研英语一
相关试题推荐
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Sevenyearsago,whenIwasvisitingGermany,Imetwithanofficialwhoexplainedtomethatthecountryhadaperfectsolution
AnearthquakehitKashmironOct.8,2005.Ittooksome75000lives,【C1】______130000andleftnearly3.5millionwithoutfood
Studythefollowingdrawingcarefullyandwriteanessayinwhichyoushould1)describethedrawing,2)interpretitsmeaningand
Youprobablyhavealongmentallistofmomentsandfactsyouwishyoucouldremember—butactuallyyoucannot.Thegoodnews,【B1
Youprobablyhavealongmentallistofmomentsandfactsyouwishyoucouldremember—butactuallyyoucannot.Thegoodnews,【B1
Youprobablyhavealongmentallistofmomentsandfactsyouwishyoucouldremember—butactuallyyoucannot.Thegoodnews,【B1
Wesufferfromaconspicuouslackofrolemodelsandsharedcauses.Thisis【B1】______ofreason,Ithink,thatmanyyoungAsian-A
Sciencefictionhasatendencytobecomesciencefact.SomethinglikeHal,theon-boardspaceshipcomputercapableofethicalde
NomatterhowlargeornotabletheU.S.travelindustryisormaybecome,itwillalwaysbeamemberofabroaderworldsociety.
随机试题
DSA成像方式分为
患者,女,26岁。G1P1,产后第1天,自己在腹部触及子宫,呈球形、质硬,询问护士是否正常,护士在讲解关于子宫复旧过程时,解释产后第1天宫底位置应在
关于漏出液的形成原因,错误的是
装车棚要装设避雷针予以保护,在油品管道进入油品装卸区时,要在进入点接地。防雷接地电阻一般不大于()。
国际期货市场的结算体系大体上可以分为下列()层次。
6C标准原则的内容不包括()。
2010年5月中国科学家发现控制水稻产量基因OsSPL14,将其植入我国南方水稻后,其产量增加了10%左右。下列有关叙述正确的是()。
水土流失
把存储在硬盘上的程序传送到指定的内存区域中,这种操作称为__________。
A、正确B、错误A词义理解题。根据原文wewanttodocumentthegirls’childhoods.Iwriteinmemorybooks,savedrawingsandtakeplentyofstillph
最新回复
(
0
)