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
2013-07-20
33
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 best title of this passage?
选项
A、Poverty and Malnutrition in Developing Countries.
B、Poverty and Malnutrition: Biotech Does Promise
C、Genetically Modified Foods Feed the World?
D、Application of Biotech Challenges World Poverty.
答案
C
解析
主旨大意题。本文第一段提出了发展中国家面临的问题;第二段指出生物科技对此可以起到一定的作用;而第三段提出生物科技还远远不能解决所有问题。由此得出结论,本文探讨的主题应该是对生物科技应用于农业以期解决温饱问题提出质疑。
转载请注明原文地址:https://kaotiyun.com/show/fin7777K
0
大学英语六级
相关试题推荐
Noiseconstitutesarealandpresentdangertopeople’shealth.Dayandnight,athome,atwork,andatplay,noisecanproduce
Noiseconstitutesarealandpresentdangertopeople’shealth.Dayandnight,athome,atwork,andatplay,noisecanproduce
A、ThepresidentsoftheUnitedStates.B、CongressoftheUSA.C、TherelationshipbetweentheRepublicanPartyandtheDemocratic
Anexerciseprogramdesignedforyoungeradultsmaybeinappropriateforolderpersons,particularlyforpersonsoverage50.Sp
Theconceptofobtainingfreshwaterfromicebergsthataretowedtopopulatedareasandaridregionsoftheworldwasoncetrea
A、Shedidn’texpectherdaughtertosingsowell.B、Shesingsbetterthanherdaughter.C、Shedoesn’tlikeherdaughtersinging.
Smokingisverypopularwithpeople.【C1】______ofthesmokersbelievethatsmokingcan【C2】______theirnerveshardenedwithsoci
A、Unemployment.B、Familybreakup.C、Mentalproblems.D、Drinking.B女士问男士。在街上流浪的是哪些人,男士说,有失业的,有精神病患者,还有一些酒鬼。这些信息中没有“家庭破裂者”
Sometwentyyearsago,theperformanceofgirlsandboysinclasswascompared.Boys【B1】_____betterinexams,sovarious【B2】___
Sometwentyyearsago,theperformanceofgirlsandboysinclasswascompared.Boys【B1】_____betterinexams,sovarious【B2】___
随机试题
在聚乙烯防腐现场补口时,当管径大于400mm时,选用的热收缩套基材厚度应不小于(),胶层厚度不小于()。
我国刑法对于空间效力的规定,采取的是()
A.急性膀胱炎B.急性肾盂肾炎C.无症状细菌尿D.尿道练合征无真性细菌尿的尿路感染是
患者,女性,妊娠39周,无诱因性阴道出血约200ml,腹部检查:腹部软无压痛,胎位清楚,胎心158次/分,阴道可见少量活动性出血。诊断可能性最大是
A公司拥有一栋写字楼,用于本公司办公使用。2012年1月1日,A公司与B公司签订经营租赁协议,将该写字楼整体出租给B公司使用,租赁期开始日为2012年1月1日,年租金为400万元,为期3年。当日,该写字楼的账面余额为3500万元,已计提折旧1000万元,公
道教神仙中,掌管福禄、主宰功名的是()。
法官:法律:犯人
请根据以下各小题的要求设计VisualBasic应用程序(包括界面和代码)。(1)在名称为Forml的窗体上建立一个名称为cmdArray的命令按钮数组,含3个命令按钮,它们的lndex属性分别为0、1、2,标题依次为“是”、“否”、“取消”,每个按钮
Johnwasinanurseryschoolforoneyear.
【61】Man’spreoccupationwithtimederivesultimatelyfromhisuniquerelationshiptoit.Allanimalsarechangedbyit.Butonl
最新回复
(
0
)