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
医学
Genetically modified crops and foods having been launched by big companies bent on taking over agriculture, this new breakthroug
Genetically modified crops and foods having been launched by big companies bent on taking over agriculture, this new breakthroug
admin
2013-11-30
93
问题
Genetically modified crops and foods having been launched by big companies bent on taking over agriculture, this new breakthrough in science poses a new problem—whether it’ s safe for people to eat them. Experts say that much of the current angst over genetically modified foods is unnecessary. If research and development are allowed to continue, the products will be there for all to appreciate.
New varieties of rice and other crops, resistant to insects and diseases, will have replaced those cultivated today. Farmers will no longer lose substantial proportions of their harvests. The impact of these advances will be felt in the less developed countries. Health benefits will also come from plants genetically engineered to be more balanced nutritionally than those that have evolved through natural selection or been bred by traditional methods.
The potential medical spin-offs from plant biotechnology are considerable. A new generation of more potent vaccines, many against illness for which no vaccines have been available, will be grown in plants such as maize and bananas.
Malnutrition could be banished. Biotechnology can improve efficiency of food production and generate more nourishing crops.
Throughout the world, gardeners, vegetarians, and consumers will benefit from plant varieties resistant to spoilage, foods which reduce our dependence on animals, and cheaper and/or tastier products.
We should not, however, overlook potential hazards in altering our diets by genetic engineering. As with all other applications of science to human welfare, biotechnology is likely to have risks. Mistakes will probably be made.
Nevertheless, any analysis of the new techniques for ferrying genes between plants must surely conclude that they are being applied and controlled more stringently than any technology ever before.
Nearly 25 years ago, when scientists first learned to combine DNA from different sources, commentators warned of the iniquity of "opening Pandora’ s box". Among their horrific forecast were unstoppable epidemics and worldwide pestilence. None of these has come to pass, partly because genetic manipulation has not proved inherently dangerous.
In addition, regulatory committees have been set up to ensure that experiments are conducted in appropriately safe conditions.
The regulators’ task is not simply to allow research to go ahead unless potential hazards are obvious. It is to consider risks that could come to light later. Will a gene, introduced intorape to protect it against virus attack, also make the pollen grains more likely to cause hay fever? All proposals have to survive positive vetting of this sort before they are sanctioned.
Genetic engineering is far more precise—and thus predictable—than the gene movements which occur in nature. When plants fertilize and cross-fertilize in the wild, large numbers of genes are transferred in a haphazard fashion.
Biotechnology allows individual genes to be moved with precision from one plant to another. It is much easier to know how one gene will work in its new setting. The likelihood of unexpected consequences and the margin of error are correspondingly reduced. There is a chance, however remote, that a gene introduced into a particular plant at one time and location might have adverse consequences if it eventually gets into another plant distant in space and time.
Given the astronomical amount of random gene transfer which occurs through the biosphere such extreme caution is unwarranted. I believe most food producers—and eaters—would agree.
In his defense of genetic technology, the author shows us the benefits produced by genetic technology EXCEPT in______.
选项
A、high-tech
B、health
C、medicine
D、agrarian production
答案
A
解析
文章第二段提到New varieties of rice and other crops可以抵御昆虫和疾病以及基因作物营养更加均衡,体现了health benefits,排除B项。第三段提到medical spin-offs,通过植入一种更有效的疫苗,玉米、香蕉等可以against illness for which no vaccineshave been available,体现了C、D项。A项“高科技”文章并未提及。
转载请注明原文地址:https://kaotiyun.com/show/1CU3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
High-speedlivinghasbecomeafactoflife,andthefranticpaceistakingitstoll,accordingtosciencewriterJamesGleick.
Despitegrowingnumbersofjoggers,CanadaFitnessSurveysacrossthecountrydemonstratethatCanadiansarelessphysicallyfit
PeoplefromaroundtheworldflocktotheUnitedStatesexpectingtofindabetterlife.Buttoscientists’surprise,agrowing
Youcanhavetoomuchofagoodthing,itseems—atleastwhenitcomestophysiotherapyafterastroke.Manydoctorsbelievetha
Youcanhavetoomuchofagoodthing,itseems—atleastwhenitcomestophysiotherapyafterastroke.Manydoctorsbelievetha
Someproblemscanbereadilyidentifiedsimplybylookingaround.Theseproblemsconcernthepollutionofourenvironmentbytec
AnabandonedairfieldnearaformerNaziconcentrationtrampmaysoonfeaturepagodasandTaiChiparks.A$700millionproject
A、Inahotel.B、Atafastfoodbar.C、Inthesupermarket.D、Inthedepartmentstore.C本题问本段对话发生在什么地方。根据对话中出现的instantsoup(速溶汤粉),
A、Thecommercialcompanieshaveinvestedalotinthenewmachine.B、Thefurtherdevelopmentofthemachineisinfinancialtrou
A、Bellevuewasahospital.B、Bellevuewasagovernment.C、Bellevuewasauniversity.D、Bellevuewasawomen’sprison.A从“Whenre
随机试题
下列哪些药物属于百合科()(1992年第137题)
28岁初孕妇,妊娠35周,自述剧烈腹痛伴发热、恶心、呕吐半日就诊。B超见子宫如孕35周,于宫底偏左有一超手拳大肌瘤。查血白细胞总数为14.4×109/L。该病与卵巢肿瘤蒂扭转在妊娠中表现不同之处是以下哪项
搬运病人正确的是
两个圆柱体x2+y2≤R2,x2+z2≤R2公共部分的体积V为()。
房屋建筑工程中,常用的有机绝热材料有( )。
发行人应披露最近()年股利分配政策、实际股利分配情况以及发行后的股利分配政策。
绩效管理在组织管理中的作用包括()。
一般企业的VI系统都会为不同类型的广告设计设定规范,主要包括()。
用0,1,2,3,4这5个数字中的4个组成的4位数中,能被6整除的数有_________个.
VisualFoxProDBMS基于的数据模型是______。
最新回复
(
0
)