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
27
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.
It can be inferred from the last paragraph that before the Second World War,______.
选项
A、malaria had taken few lives in Sri Lanka
B、malaria had been a very serious problem in lowland regions in Sri Lanka
C、malaria had remained unrestrained in Sri Lanka
D、malaria had been already put under control in Sri Lanka
答案
B
解析
从文中可以看出,技术进步消灭了导致疾病的蚊子,并因而使科研人员认为技术进步是预期寿命上升的主要原因。可见,当时 malaria在斯里兰卡是一个严重的问题。
转载请注明原文地址:https://kaotiyun.com/show/fLjd777K
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
CustomsofficersataLondonairportyesterdayfound$500,000worthofdrugswhichwerebeingsmuggled(走私)intoBritaininboxes
CustomsofficersataLondonairportyesterdayfound$500,000worthofdrugswhichwerebeingsmuggled(走私)intoBritaininboxes
CustomsofficersataLondonairportyesterdayfound$500,000worthofdrugswhichwerebeingsmuggled(走私)intoBritaininboxes
Apersonmayhaveanideaabouthimselfthatwillpreventhimfromdoinggoodwork.Hemayhavetheideathatheisnotcapable
Usuallywhenweheartheword"artist"wethinkofapersonwhopaintspictures,butthewordhasamuchwidermeaningthanthat
Writeaparagraphofabout120wordsexplaininghowtheduesofmembershiparespent.Usetheinformationcontainedinthegraph
Weshouldalsoknowthat"greed"islittlerelatedtotheenvironmentalcrisis.Thetwomainfactorsarepopulationpressures,e
Medicinecomesinmanyforms.Initsliquidform,medicineaffectsthebodyveryquickly.Buttheeffectsofliquidmedicinearc
随机试题
木火刑金,属于
从一出生就具备而且永不消失的反射是
在我国用于烧伤成人的能量消耗计算方法是
下列关于挖孔灌注桩施工的说法,错误的是()。
“备案号”栏应填()。“单价”栏应填()。
造成旅游计划和日程变更的原因包括()。
已经获得的知识、动作技能、情感和态度等对新的学习的影响称为学习的()
请简述有关歌唱的简单知识和技能。
某区生态环境局以秦某的公司污染环境为由,作出罚款5万元的处罚。秦某不服,向区政府申请复议,区政府维持了原处罚决定。秦某提起行政诉讼。下列主体作为被告最合理的是()。
某高中学校举行运动会,高一、高二、高三学生列成方队,每个年级队伍均为240人,分成6个竖列依次行进。高一队伍前后每人间隔1米,高二队伍前后每人间隔1.5米,高三队伍前后每人间隔2.5米。每个年级队伍之间间隔5米,所有年级队伍的行进速度均为60米每分钟,则三
最新回复
(
0
)