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
2013-02-05
39
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.
Biotech can’t solve the problem of distributing food in developing countries because______.
选项
A、enough food can be produced to feed the world population
B、the transport infrastructures in some countries are backward
C、biotech itself can not play its role in those countries
D、farmers in those countries have no right to use the technology
答案
B
解析
细节辨认题。文章提出,从整体上看,世界生产的粮食总量足够养活所有人,但大部分粮食却不是在需要的地方。尤其在道路运输基础设施落后的国家,生物科技为食物供给带来的希望有多大,地理条件对食物供给的限制就有多大。由此可得B)为答案。
转载请注明原文地址:https://kaotiyun.com/show/SjI7777K
0
大学英语六级
相关试题推荐
Childrenhavebeensaidtohavebrain-injuredchildsyndrome,hyperactive(极度活跃的)childsyndromeandattention-deficitdisorder
Childrenhavebeensaidtohavebrain-injuredchildsyndrome,hyperactive(极度活跃的)childsyndromeandattention-deficitdisorder
Childrenhavebeensaidtohavebrain-injuredchildsyndrome,hyperactive(极度活跃的)childsyndromeandattention-deficitdisorder
ThegovernmentofUKislaunchingaprogramaimingathelpingmorefamiliesbalancetheirworkandhomelives.Therighttoask
A、Someonewhoalwaystalksabouthimself.B、Themostviolenttypeofco-workers.C、Someonewhostabsyourback.D、Themostcommo
Don’tworry,behappyand,accordingtoanewresearch,youwillalsobehealthy.Itisestimatedthatoverthecourseofon
A、Thefast-developingtechnology.B、Thepeoplewhodesigndifferentapplications.C、ThewayhowpeoplemakeuseoftheInternet.
Hasyourchildcrackedabookthissummer?Althoughadultsoftenjumpatthechancetocatchupontheirreadingduringvaca
A、Fromthelatter’srivalsDylans.B、Fromthewrappingpaperofabook.C、Fromararefirsteditionofadictionary.D、Fromadi
Personalityistoalargeextentinherent—A-typeparentsusuallybringaboutA-type【B1】______.Buttheenvironmentmustalsoh
随机试题
正常阴道寄居微生物不包括
主治白喉的方剂是
急性粒细胞白血病的骨髓象不具有下列哪些改变
依据《环境影响评价技术导则大气环境》,对于新建项目一、二级评价项目,大气污染源调查与分析对象应包括()。
当公司筹集的资金超过一定限度时,原来的资本成本就会增加,追加一个单位的资本增加的成本称为边际资本成本。()
在一条点对点链路上,为了减少地址的浪费,子网掩码应该指定为()。
经济学家:现在中央政府是按照GDP指标考量地方政府的政绩。要提高地方的GDP,需要大量资金。在现行体制下,地方政府只有通过转让土地才能筹集大量资金。要想高价拍卖土地,则房价必须高,因此地方政府有很强的推高房价的动力。但中央政府已经出台一系列措施稳定房价,如
Astheymove,glacierspushpilesofrocksaheadofthem.
BernardBailynhasrecentlyreinterpretedtheearlyhistoryoftheUnitedStatesbyapplyingnewsocialresearchfindingsonthe
GenerationXXLAsocietyofobesechildrenChildren’simpulseshaven’tchangedmuchinrecentdecades.Butsocialforces
最新回复
(
0
)