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
With rapid growth of world population, mainly in developing countries, the available cultivable land per person has declined ste
With rapid growth of world population, mainly in developing countries, the available cultivable land per person has declined ste
admin
2012-05-28
51
问题
With rapid growth of world population, mainly in developing countries, the available cultivable land per person has declined steadily since 1960 and will decease by half over the next 50 years. Besides, about 400 million women of childbearing age are iron deficient, leaving their babies exposed to various birth defects. As many as 100 million children suffer from vitamin A deficiency. Tens of millions of people Suffer from other major ailments (疾病) and nutritional deficiencies caused by lack of food.
How can biotech help? Biotechnologists have developed genetically modified rice that is fortified with beta-carotene (β胡萝卜素) and additional iron, and they are working on other kinds of nutritionally improved crops. Biotech can also improve farming productivity in places where crop failures are caused by pests, drought, poor soil and crop viruses or bacteria. Genetically modified, virus-resistant crops can reduce that damage, as can drought-tolerant seeds in regions where water shortages limit the amount of land under cultivation. Biotech can also help solve the problem of soil that contains excess aluminum, which damages roots and causes crop failures.
Many scientists believe biotech could raise overall crop productivity in developing countries as much as 25% and help prevent the loss of those crops after they are harvested. Yet for all that promise, biotech is far from being the whole answer. In developing countries, lost crops are only one cause of hunger. Poverty plays the largest role. Making genetically modified crops available will not reduce hunger if farmers cannot afford to grow them or if the local population cannot afford to buy the food those farmers produce.
Nor can biotech overcome the challenge of distributing food in developing countries. Taken as a whole, the world produces enough food to feed everyone—but much of it is in the wrong place. Especially in countries with undeveloped transport infrastructures, geography restricts food availability as dramatically as genetics promises to improve it.
Biotech has its own "distribution" problems. Private-sector biotech companies in rich countries carry out much of the leading-edge research. Their products are often too costly for poor farmers in the developing world, and many of those products won’t even reach the regions where they are most needed. Biotech firms have a strong financial incentive to target rich markets first to help them rapidly recoup (收回) the high costs of product development. But some companies are responding to the needs.
What is the main factor leading to a huge underfed population in developing countries?
选项
A、Crop failure.
B、Poverty.
C、Food shortage.
D、Eco-damage.
答案
B
解析
细节辨认题。题干中的underfed意为“吃不饱的”,是对原文中hunger的同义转述。文章指出,发展中国家作物歉收只是造成饥饿的一个原因,贫穷才是罪魁祸首。
转载请注明原文地址:https://jikaoti.com/ti/5dvFFFFM
0
大学英语六级
相关试题推荐
A、Lateinthemorning.B、Earlyintheafternoon.C、Sometimebeforedawn.D、Shortlyaftersunrise.C推理判断题。男士在报道中提到it’sfearedth
WhenToyotaMotorCorp.movedoneofitsdivisionsintoanenvironmentallyfriendly,or"green",buildinginTorrancethreeyear
A、Thepatternsofmarriagehavechanged.B、Manydeafpeoplehaveregainedtheirhearing.C、Mostoftheoriginalpopulationhave
A、Noteatingbreakfastmightaffectthehealthofchildren.B、Breakfastdoesnotaffectperformance.C、ProfessorBendoroncetau
WaystoTakeIttotheNextLevelNomatterwhatyou’redoing,therecomesatimewhenyouaregoingtowanttotakethings
A、Themaincampus.B、Thestudentpopulation.C、Theage-oldideals.D、TheprogramsoftheDivisionofContinuingEducation.C细节题。
Therearemanykindsoflibrariesintheworld.Andwecouldborrowbooksorgettheinformationfromit.Theymaybe【B1】______
WhichofthefollowingdoIPrightsprotect?
Psychologistsarefindingthathopeplaysasurprisinglyvitalroleingivingpeopleameasurableadvantageinrealmsas【B1】____
______(和远方的朋友保持联系)isnoeasyjobatall;atleastitisforme.
随机试题
从句子语气类来看,“我的妈呀,总算找到了!”属于()
《阳春集》的作者写出的名句是()
人民群众创造历史表现在哪些方面?
()包括了对自然和社会的本质内涵、规律的认识,以及经验。
监理工程师对勘察成果的审核与评定是勘察阶段最重要的监理工作,勘察成果应()。
某生产企业为增值税一般纳税人,经认定为国家扶持的高新技术企业,2016年有关经营情况和纳税情况如下:(1)销售收入230万元,销售成本120万元。(2)投资收益共计100万元,全部为国债利息收入。(3)销售费用60万元,其中广告费5万元、业务宣传费3
广西水能资源蕴藏量大,其中()被称为中国水电的“富矿”或“能源的宝库”,是中国优先开发的三大水电建设基地之一。
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性。
在操作系统中,解决进程间的(1)两种基本关系,往往运用对信号量进行(2)的(3)。例如,为保证系统数据库的完整性,可以把信号量定义为某个库文件(或记录)的锁,初值为1,任何进程存取该库文件(或记录)之前先对它作一个(4),存取之后对它作一个(5),从而做到
ImportanceofChildren’sOralHealth FebruaryisNationalChildren’sDental(牙齿的)HealthMonth,butinchildrengoodoralcarei
最新回复
(
0
)