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
While it can’t yet be said that every mouthful of food has been changed through genetic engineering, it is likely that almost ev
While it can’t yet be said that every mouthful of food has been changed through genetic engineering, it is likely that almost ev
admin
2010-05-09
48
问题
While it can’t yet be said that every mouthful of food has been changed through genetic engineering, it is likely that almost every American has had a mouthful of engineered food.
Take the soybean, for example. About 55 percent of last year’s crop was genetically engineered in some fashion, reports the American Soybean Association. And though few Americans sit down to a plate of soybeans for dinner, these soybeans arrive through the back door as an additive to scores of foods like cooking oils, salad dressings, coffee creamers, beer, cereals and candy.
America is on the verge of a second green revolution. The first tripled world food output over the course of a mere three decades during the late 20th century. Scientists boosted crop yields by crossbreeding (杂交) related plants that add desirable traits. Then farmers added fertilizer, pesticide, and irrigation in order to make the high-yield crops thrive.
Now that those gains are leveling off, scientists are looking to biotechnology to increase food production even more. This time, instead of breeding plants with their closest relatives, scientists are inserting genes. For example, genes from flounders can help ordinary plants like tomatoes and strawberries fight the cold. Researchers are also inserting bacterial genes into corn and soybean plants to better protect them from insects or render them immune to certain herbicides (除草剂).
The technology has enormous potential. The application of biotechnology is going to produce a set of possibilities that we simply cannot conceive of, even in our most imaginative flights of fancy. For farmers, crops engineered with genes that resist cold, drought, or other adverse weather conditions can boost crop yields with less money and effort. For consumers, that could mean cheaper food. Such crops would also help feed and better nourish people in developing nations, such as drought-ridden Africa.
But as these crops begin infiltrating (渗透) our food supply, environmental and consumer groups have begun to question whether potential risks to the environment and human health have been adequately studied. Last year, for example, biologists for the first time found evidence suggesting that planting genetically modified com in open fields may kill butterflies who feed on the corn’s pollen. Scientists are also questioning whether foods with a gene inserted to improve one area of their performance could prove detrimental in another: For one thing, the genes might cause allergic reactions in people who never had a reaction to that food before.
The best title for this passage might be ______.
选项
A、Biotechnology—Another Green Revolution.
B、Biotechnology—Hope and Concerns
C、Soybean—the Future Dinner Food for Americans
D、Scientific Research in Agriculture
答案
B
解析
主旨大意题。文章通篇进述了生物基因工程给人类带来的好处以及专家们对此的一些担忧,因此B项正确。
转载请注明原文地址:https://kaotiyun.com/show/B7OK777K
0
大学英语六级
相关试题推荐
Accordingtothepassage,asafamousscientist,Newtonhave______theories.______theoryisusedfrequentlytointerpretlig
MarkTwainwasbornduringtheperiodoftheIndustrialRevolution.WhenMarkTwainbecameaminerinthefrontierregion,hes
Asrecentlyasthirtyyearsago,manyAmericansbelievedthatusingcreditwasanunwiseand(36)______waytopayforwhatthey
A、It’saconcert.B、It’sacircus.C、It’sagame.D、It’samovie.BWhatisCirqueduSoleil?综合推断题。女士说朋友带自己去看了太阳剧团(CirqueduSol
Bystating"ThebusinessofAmericaisbusiness"PresidentCoolidgesuggeststhatbusinessisof______toAmericans.According
A、EveryyearinMarch.B、Everyotheryear.C、Fromtwotothreeweeks.D、Thewinterof1925.AWhenistheraceheld?信息明示题。根据The
The386pigletswrongfullysoldintofoodsupplyarefrom______.Thepurposeofthetransgenicengineeringresearchisto____
A、Mice.B、Rats.C、Monkeys.D、A,BandCD文中我们可以听到:Onewaythatscientistslearnaboutmanisbyanimals,suchasmice,ratsandmon
A、Paris.B、Copenhagen.C、NewYork.D、London.D文中的细节有两个,—个是“CoxscoredavictoryontsidetheU.S.”“Coxhopestowinagaininnex
A、Becausenobodyknewhisaddress.B、Becausenobodyknewhisage.C、BecausePenbury’sprivatelifewasasecret.D、BecausePenbu
随机试题
下列哪一种物质不参与甘油三酯的消化并吸收人血的过程?()
A、 B、 C、 D、 C
A.3—4小时B.24小时C.24—48小时D.2—3天E.4—7天急性失血出现贫血一般需经
霍乱与副霍乱的常见表现为
A.碳酸钙B.十二醇硫酸钠C.口气清新D.丙二醇或甘油E.氟化物
西咪替丁治疗十二指肠溃疡的作用机制是
下列房地产经纪机构的组织结构形式中,采用()组织结构形式时,由职能机构派出、参加横向机构(事业部或项目组)的人员,既受所属职能机构领导,又接受横向机构领导。
项目建成标志中的“工程建成”的指()。
撰写会议总结应注意()。
根据公务员考核的有关规定,连续()年年度考核被评为“不称职”等级的公务员将被辞退。
最新回复
(
0
)