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
59
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.
Biotechnologists can help reduce illnesses related to nutritional deficiencies by______.
选项
A、developing genetically modified or nutritionally improved crops
B、incorporating pest-resistant or virus-resistant genes into seeds of crops
C、improving the ability of seeds to resist water shortages in certain regions
D、solving the problem of soil that contains excess aluminum
答案
A
解析
事实细节题。第二段主要说明生物科技尤其是转基因技术在农业中的应用,首先承接第一段中的种种问题,提出生物科技专家们培育转基因水稻和其他增强营养成分的作物可以解决营养不良的问题。故A)为本题答案。
转载请注明原文地址:https://kaotiyun.com/show/qjI7777K
0
大学英语六级
相关试题推荐
Technologywassupposedtosetusfree,butinthecarindustryit’slockingusoutofourvehicles.Andasmanymorecarkeysc
Isyourfamilyinterestedinbuyingadog?Adogcanbeahappy【B1】______toyourfamily,butifyouchoosethewrongkindofdog
A、Heisasfatasapotato.B、HeisfondofwatchingTV.C、Helikespotatoesverymuch.D、Hedoesn’tknowmuchaboutTV.B由男士提到的
A、Towriteabusinessletter.B、Toprovideproofofthedeal.C、Tofindoutthemistakesofaletter.D、Tofinishreadingthele
Personalityistoalargeextentinherent—A-typeparentsusuallybringaboutA-type【B1】______.Buttheenvironmentmustalsoh
Nothingmakesushappierthanourfamiliesandlovedones,______(面对面的交流给人带来的快乐远超过社交网络).
ThroughoutGeorgeBush’spresidency,thefederalgovernmenthasrefusedtosupportanyregulationofthegreenhousegasesthatc
It’sthemedia’sresponsibilitytohelpthosewhoarekeptsilentbytheirhumblesocialpositionsto___________theirwishes.
A、Hispaycheckislate.B、Thebookbagistooexpensive.C、Hecan’tlendthewomananymoney.D、Thewomandoesn’tneedanewboo
随机试题
下列哪种物质不能抑制GnRH的分泌?
患者,女,40岁。初秋患痢,症见腹痛,痢下赤白脓血,黏稠如胶冻,里急后重,口渴饮冷,舌红苔黄腻,脉滑数。治疗方剂最宜
关于C1INH缺陷病下述哪项是错误的
患者,男,67岁。肺脓肿1个月,目前仍高热、脓痰,肺空洞2cm,最有效的治疗是
下列各项属于人寿保险的特点的是( )。Ⅰ.生命风险的特殊性Ⅱ.保险标的特殊性Ⅲ.保险金额确定与给付的特殊性Ⅳ.保险利益的特殊性Ⅴ.保险期限的特殊性
对于附有销售退回条件的商品销售,如果不能合理确定退货的可能性,应在售出商品的退货期满时确认收入。()
下列关于医学常识的表述,正确的是:
简述判断死锁的必要条件。
求下列极限:
J.Martin指出,系统开发所建立的企业模型应具有若干特性,以下哪个不在其要求之列?
最新回复
(
0
)