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
43
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://www.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
Readthefollowingparagraphsinwhich5peopletalkaboutwhatmendon’tunderstandaboutwomen.Forquestions61to65,match
Geographyisthestudyoftherelationshipbetweenpeopleandland.Geographerscompareandcontrast【C1】______placesontheeart
Newtechnologylinkstheworldasneverbefore.Ourplanethasshrunk.It’snowa"globlevillage"wherecountriesareonlyseco
Writeaparagraphofabout120wordsexplaininghowtheduesofmembershiparespent.Usetheinformationcontainedinthegraph
Therewasonethoughtthatairpollutionaffectedonlytheareaimmediatelyaroundlargecitieswithfactoriesandheavyautom
Largeanimalslivinginthedeserthavedevelopedanumberofadaptationsforreducingtheeffectsofextremeheat.Oneadaptati
Medicinecomesinmanyforms.Initsliquidform,medicineaffectsthebodyveryquickly.Buttheeffectsofliquidmedicinearc
Blinkscantakeseveralforms.Besidestheblinksthatwashtheeye,therearethoseassociatedwithunexpectedcircumstances(s
AnnBest:Yourspecialreportonnewmedicinesshowedthereisthrillingpromiseinfuture"cures"forsomanydiseasesthat
随机试题
设二阶矩阵A=,则|2A2|=_______.
A.结构基因B.操纵基因C.调节基因D.抑癌基因E.癌基因表达阻遏蛋白的基因是
如上哪项是心神不宁型心悸的临床表现如上哪项是心血不足型心悸的临床表现
对绩效改进效果进行评价的维度包括()。
一般资料:求助者,男性,29岁,自考本科毕业生。因与父母有矛盾,前来求助。下面是心理咨询师与求助者的咨询对话。求助者:我最近一个月特烦。心理咨询师:你能对我详细讲讲烦恼的原因吗?求助者:老爸老妈结起伙来整天追着我说个
对于在校未成年人犯罪的现象你怎么看?
下图所示的PCB(进程控制块)的组织方式是(24),图中(25)。(24)
A、结识更多人B、感觉更刺激C、学会了珍惜D、对金钱认识更深刻B
Accordingtothesurvey,howmanypeopledoNOThavebreakfast?
Genderequality,isawell-definedby-productofhumandevelopment.Italways【C1】______tohowtofocusattentiononwomenempowe
最新回复
(
0
)