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
45
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.
The author holds that______.
选项
A、mortality rates in developing countries have been brought down by a number of forces
B、medical innovations are the only way to reduce mortality rates in developing countries
C、the upgrading of hygiene and sanitation has played a crucial role in reducing mortality rates in developing countries
D、improved nutrition is the only one factor that reduces mortality rates in developing countries
答案
A
解析
文中第二段论述了降低死亡率的多种因素。
转载请注明原文地址:https://kaotiyun.com/show/5Ljd777K
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?
Readthefollowingparagraphsinwhich5peopletalkaboutwhatmendon’tunderstandaboutwomen.Forquestions61to65,match
Geographyisthestudyoftherelationshipbetweenpeopleandland.Geographerscompareandcontrast【C1】______placesontheeart
Newtechnologylinkstheworldasneverbefore.Ourplanethasshrunk.It’snowa"globlevillage"wherecountriesareonlyseco
Newtechnologylinkstheworldasneverbefore.Ourplanethasshrunk.It’snowa"globlevillage"wherecountriesareonlyseco
CustomsofficersataLondonairportyesterdayfound$500,000worthofdrugswhichwerebeingsmuggled(走私)intoBritaininboxes
Apersonmayhaveanideaabouthimselfthatwillpreventhimfromdoinggoodwork.Hemayhavetheideathatheisnotcapable
Apersonmayhaveanideaabouthimselfthatwillpreventhimfromdoinggoodwork.Hemayhavetheideathatheisnotcapable
Weshouldalsoknowthat"greed"islittlerelatedtotheenvironmentalcrisis.Thetwomainfactorsarepopulationpressures,e
Blinkscantakeseveralforms.Besidestheblinksthatwashtheeye,therearethoseassociatedwithunexpectedcircumstances(s
随机试题
交换的构成要素包括()
提高生产率的目的就是降低成本,提高经济效益。()
《晞发集》的作者是()
赤霉病麦中毒的病原物质为
A.宫颈癌B.外阴炎C.痛经D.阴道炎E.乳腺炎贴敷法可用于
患者,女,18岁。右食指被铁钉刺伤7天,现头晕头痛,张口不利,咀嚼无力。其诊断是
主张“非礼勿视,非礼勿听”的教育家是()。
科学家卡特赖特专门设计了一套关于梦和智能活动相联系的实验。结果发现,人在经过有梦的睡眠后,他对待问题时常常能从不利的方面来看,如果梦的内容是不愉快的,那么醒来后就会更能适应面对难题的现实环境,从而也就增加了解决难题的能力。除此以外,白天冥思苦想的人进入到梦
Wheredoesthisconversationmostprobablytakeplace?
Craigassuredhisbossthathewould______allhisenergiesindoingthisnewjob.
最新回复
(
0
)