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
外语
The principal factor depressing life expectancy in developing countries has always been the high death rate for infants and chil
The principal factor depressing life expectancy in developing countries has always been the high death rate for infants and chil
admin
2011-03-01
40
问题
The principal factor depressing life expectancy in developing countries has always been the high death rate for infants and children. The World Bank studies suggest that as much as two thirds of the difference in life-spans between people in developed countries and those in developing ones can be traced to differences in survival rates for children under five. It is here where the most improvement has come. According to UN estimates, significant regional drops in infant mortality - ranging from 25 percent to 60 percent and centering near 40 percent - appear to have taken place between the late 1950s and the late 1970s in northern Africa, Latin America, and Asia. Although sub-Saharan Africa’ s mortality trends cannot be quantified with confidence, there is reason to believe that life expectancy has risen and infant mortality has declined in that region as well. There is little doubt that population growth has accelerated in sub-Saharan Africa since the 1950s; in fact, sub-Saharan Africa is widely thought to have the highest rate of population growth of any major region in the world. Only a small portion of that acceleration is likely to have been caused by increases in fertility (and increases in fertility, insofar as they have occurred, may also imply improvements in health and nutrition).
Mortality, of course, is not a perfect measure of nutritional change. Improved nutrition is only one of a number of forces that have been pushing down death rates in developing countries. Others include the upgrading of hygiene and sanitation; the extension of public health services; medical innovations; improvements in education, communications, transportation, and, in some areas, civil order. Even so, the extent to which improvements innutrition—both direct and indirect—have reduced mortality in developing countries has frequently been underestimated. For example, Sri Lanka experienced an abrupt jump in life expectancy shortly after the Second World War. Whereas this was long described as a "technical fix"—a triumph of DDT over the anopheles mosquito—years later researchers realized that abrupt and rapid drops in mortality had also taken place in Sri Lanka’ s highlands, or "dry zones", where malaria had never been a serious problem. In both highlands and lowland regions health improved in tandem with access to food.
According to the author, life expectancy in developing countries is not high mainly because developing countries______.
选项
A、have a low standard of living
B、have no public health services
C、have no public and private hygiene and sanitation
D、have low survival rates for infants and children
答案
D
解析
从第一段第二句可以看出答案。
转载请注明原文地址:https://kaotiyun.com/show/uLjd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Whichofthefollowingisthefactorthatdetermineshumanbeings’psychologicalspaceneeds?
Geographyisthestudyoftherelationshipbetweenpeopleandland.Geographerscompareandcontrast【C1】______placesontheeart
CustomsofficersataLondonairportyesterdayfound$500,000worthofdrugswhichwerebeingsmuggled(走私)intoBritaininboxes
CustomsofficersataLondonairportyesterdayfound$500,000worthofdrugswhichwerebeingsmuggled(走私)intoBritaininboxes
Apersonmayhaveanideaabouthimselfthatwillpreventhimfromdoinggoodwork.Hemayhavetheideathatheisnotcapable
SupposethatyouarethepresidentofPekingUniversityofTraditionalMedicineandinviteProf.Hopkinson,anAmericanmedical
Largeanimalslivinginthedeserthavedevelopedanumberofadaptationsforreducingtheeffectsofextremeheat.Oneadaptati
Largeanimalslivinginthedeserthavedevelopedanumberofadaptationsforreducingtheeffectsofextremeheat.Oneadaptati
Medicinecomesinmanyforms.Initsliquidform,medicineaffectsthebodyveryquickly.Buttheeffectsofliquidmedicinearc
Medicinecomesinmanyforms.Initsliquidform,medicineaffectsthebodyveryquickly.Buttheeffectsofliquidmedicinearc
随机试题
国家行政权力的重要基础是()
下列哪项不是功血的诱因
逆行性感染导致的急性肾盂肾炎,最先受累的是
某建设项目在实施过程中发生了以下3个事件:事件1:该建设项目的业主提供了地质勘察报告,报告显示地下土质很好。承包商以此作了施工方案,拟用挖方余土做通往项目所在地道路基础的填方。由于基础开挖施工时正值雨季,开挖后土方潮湿,且易破碎,不符合道路填筑要求
我国内地江西南昌的A公司委托沿海浙江宁波的B公司从国外进口机器一台,合同规定买方对货物品质不符合合同的索赔期限为货到目的港30天内。货到宁波后,B公司立即将机器转至江西南昌交给A公司。由于A公司的厂房尚未建好,机器无法安装,4个月后,待厂房完工,机器装好,
()是党的根本组织制度。
长时间以来,英国的医生认为戴墨镜的病人更易于消沉并患上忧郁症。对因诸如心脏疼痛和消化不良等身体不适而住院的病人进行的心理测试证实了这一联系。或许觉得周围的一切使得心理上痛苦的人选择这样的墨镜去减少视觉刺激,视觉刺激被认为是令人易发怒的。不管怎么说,人们可以
Mostepisodesofabsent-mindedness—forgettingwhereyouleftsomethingorwonderingwhyyoujustenteredaroomarecausedbya
Itisverydifficulttosayjustwhencolonizationbegan.ThefirsthundredyearsafterChristopherColumbus’sjourneyofdiscov
A、Becausemanyyoungpeoplehavemovedintocomfortableapartments.B、Becausemanyoldhousesinthepoorareaofthetownaren
最新回复
(
0
)