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
专升本
Across the United States, scientists are mounting what may become the most innovative agricultural research drive since the 1920
Across the United States, scientists are mounting what may become the most innovative agricultural research drive since the 1920
admin
2011-04-26
33
问题
Across the United States, scientists are mounting what may become the most innovative agricultural research drive since the 1920s,when hybrid corn was developed. Surprisingly, the new genetic revolution is not taking place in America’s fields.
Instead, it is occurring in biology laboratories, for it involves the deliberate manipulation in test tubes of the genes of crop plants.
This genetic engineering may prove the biggest boon to agriculture since plant breeding began.
The new concepts grew out of the bioengineering of bacteria for the production of such things as human hormones and vaccines for viral diseases. Plant cells, however, are far more complex than bacteria, and it will probably take many years for today’s encouraging laboratory results to have a major impact on the farm. In fact the payoff may not come until the next century.
But although biotechnologists are still in the earliest phases of this new field of science, they are already actively exploring ways to redesign plants so they will use sunlight more efficiently, resist viruses and other pests, grow in hot or dry areas, in saline soils or in the presence of pesticides, and perhaps even make their own fertilizer out of nitrogen in the air. In addition, scientists have had early success in making wholly new plants that are unavailable by conventional plant breeding--a potato-tomato combination, for example.
The new technology holds the promise of virtually limitless horizons in food production. Only imagination sets the limits: frost-resistant wheat, tropical potatoes, saltwater rice, a plant producing a combination of a pea and a carrot--all may be with us one day.
From the passage we understand that conventional plant breeding produced ______.
选项
A、a potato-tomato hybrid
B、new plant technology
C、self-fertilizing plants
D、less dramatic results than the new technology
答案
D
解析
本题为细节推断题。在第三段中提到“In addition,scientists have had early success in making wholly new plants that are unavailable by conventional plant breeding——a potato— tomato combination,for example.(另外,科学家们已经成功地研制出全新的植物,例如土豆和番茄的杂交品种,这是传统的植物培养技术望尘莫及的。)”由此可见,传统的植物培养技术无法培育出土豆和番茄的杂交品种,当然没有新技术那样不可思议。
转载请注明原文地址:https://kaotiyun.com/show/I0qC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Thispassageismainlyabouthowto______Theexpression"booksofaboutyourlevelofability..."inthefirstparagraphisc
Thefirstsentenceletsusknowthatthispassageisabout______.Thewritercomparesturtlestomountainclimbers
Accordingtothepassage,theauthorthinksofeachinterviewas______.Whenhuntingajob,you’dbettercommunicatewithpeop
DriversontheBasingstokeby-passusedtohavetheirattentiondiverted(转移)byasignthatread:AMOMENT’SINATTENTIONCAUSES
Thepatienthastotakeseveralpillseachdayto______(act)highbloodpressure.
Smokingduringpregnancycould______(danger)yourbaby’shealth.
Thetreatywasmadetoprotectthecountry______invasionbyitsneighbours.
Bywatchingthemovementsofthespeaker’slips,adeafpersoncanactuallysee______thepersonattheothertelephoneissaying
Herearetwolettersfromourreadersexpressingtheirconcernaboutschoolassessment(评价):Studentsshouldbeallowedtos
Client:Hello.MayIspeaktoMr.Turner?Secretary:______
随机试题
检查振荡器是否起振最好的方法是()。
Task2A.rapidlyreductionintheamountoielectricityB.harmingthepeopleC.throughthepipesD.agreatexpenseE.t
多余约束是体系中不需要的约束。()
下列关于生长激素作用的描述错误的是
《水利工程建设重大质量与安全事故应急预案》属于(),是关于事故灾难的应急预案。
某化妆品厂受托加工一批高档化妆品,委托方提供原材料成本50000元,该厂收取加工费20000元、代垫辅助材料款10000元,该厂没有同类高档化妆品销售价格。该厂应代收代缴消费税()元。(高档化妆品的消费税税率为15%,以上款项均不含增值税)
海洋是陆域通过流域的自然延伸,在海洋开发活动中,海洋捕捞、海上运输、海洋矿产开发和海水养殖等生产环节是在海域和流域共同完成;而海盐业和海水利用等则完全是在陆域上完成所有生产环节。此外,现代科学技术发展在推动海洋科技进步、海洋产业发展的同时.海洋高新技术的发
从20世纪90年代“人类基因工程”计划启动之日起,美国、日本和欧洲等展开了一场激烈的基因专利争夺战。因为谁拥有专利,就意味着谁就能在国际上获得________基因产业的“王牌”,谁就能拥有今后基因开发的庞大市场。为此,美国等少数发达国家大量地将阶段性研究成
Youwillhearaspeakeraddressingagroupofinvestorsattendingaseminartolearnabouttheadvancedbusinesspractice.A
SensibilityandSensitivityisagoodmoviebyanystandards:______itshouldrankhighonanylistofromance.
最新回复
(
0
)