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
考研
Until about four decades ago, crop yields in agricultural systems depended on (1)_____ resources, recycling organic matter, buil
Until about four decades ago, crop yields in agricultural systems depended on (1)_____ resources, recycling organic matter, buil
admin
2010-06-17
58
问题
Until about four decades ago, crop yields in agricultural systems depended on (1)_____ resources, recycling organic matter, built-in biological control mechanisms and rainfall patterns. Agricultural yields were (2)_____ but stable. Production was (3)_____ by growing more than one crop or variety in space and time in a field as insurance against pest (4)_____ or severe weather. Inputs of nitrogen were (5)_____ by rotating major field crops with legumes. In turn, rotations suppressed insects, weeds and diseases by effectively (6)_____ the life cycles of these pests. A typical corn belt farmer grew corn (7)_____ with several crops including soybeans, and small grain production was intrinsic to maintain livestock. Most of the labor was done by the family with occasional hired help and no (8)_____ equipment or services were purchased from off4arm sources. In these type of farming systems the link between agriculture and ecology was quite (9)_____ and signs of environment degradation were seldom evident.
But as agriculture modernization (10)_____ the ecology-farming linkage was often broken as ecological principles were (11)_____. In fact, several agricultural scientists have arrived at a (12)_____ consensus that modem agriculture confronts an environment crisis. A growing number of people have become concerned about the long-term (13)_____ of existing food production systems. Evidence has shown that (14)_____ the present capital-and-technology-intensive fanning systems have been extremely productive and competitive, they also bring a (15)_____ of economic, environmental and social problems.
Evidence also shows that the very nature of the agricultural structure and prevailing polices have led to this environmental (16)_____ by favoring large farm size, specialized production, crop monocultures and mechanization. Today as more and more farmers are integrated (17)_____ international economies, imperatives to (18)_____ disappear and monocultures are rewarded by economies of scale. In turn, lack of rotations and diversification (19)_____ key self-regulating mechanisms, turning monocultures into highly (20)_____ agro-ecosystems dependent on high chemical inputs.
选项
A、progressed
B、processed
C、provoked
D、prolonged
答案
A
解析
考查上下文语义衔接。生态和农业关系被打破是随着农业现代化的发展而来的,所以正确的只能是progress"进步,进行"。process是"处理,加工",provoke是"惹起,激怒",prolong"延长,拖延",都不符合文义。
转载请注明原文地址:https://kaotiyun.com/show/Mu44777K
0
考研英语一
相关试题推荐
Aneweconomicspaperhassomeold-fashionedadviceforpeoplenavigatingthestressesoflife:Findaspousewhoisalsoyourb
TherearemanyreasonsforthesorrystateofcommercialaviationinAmerica.ButIcometoyouasatechnologycolumnisttotel
Gentz,a34-year-oldGermanwhoisaco-founderofZalando—aEuropeancloneofZappos,theonlineUSshoesandfashionretailer
YourfriendTomhasbeenaddictedtoonlinegamesforalongtime,thuslaggingbehindothersinstudy.Writehimaletterto1)
Howbesttosolvethepollutionproblemsofacitysunksodeepwithinsulfurouscloudsthatitwasdescribedashellonearth?
Universityusedtobeforaprivilegedfew.Insomecountriesitisnowalmostariteofpassage.Althoughthatisexcellentnew
[A]Seekprofessionalhelp[B]Recognizeyourisolation[C]Avoidfallingintothehole[D]TakeaWiFi-freevacatio
Manyexpertsbelievethatinthenewworldofartificialintelligence(AI)humanbeingswillstillbeneededtodothejobsthat
Internetadvertisingisbooming.Theindustryhasgonefrom$9.6billioninrevenuein2001to$27billionthisyear,according
Ashumanchildrenareunusuallydependentfaranunusuallylongtime,it’sobviousthateverysocietymustprovideadomesticco
随机试题
为防止锅炉炉膛爆炸,启动燃气锅炉的顺序为()。
关于典型支气管哮喘的临床表现,下列哪项描述是正确的
在实践中,金融期货的类型主要有()。
信用社为单位开立一般存款户、专用存款户、临时存款户的,须自开户日起(),书面通知基本存款账户开户单位。
集体活动是“面向全体”,小组和个别活动是“照顾个别差异”。()(山东)
根据《国家安全法》的有关规定,可以依法搜集涉及国家安全的情报信息的是()。
①对发展中国家和新兴市场国家尤其如此②很大原因是因为中国仍然保持着对资本流动的严格控制③作为一个发展中国家,中国之所以在过去这些年屡屡可以躲过金融危机的直接冲击④资本的自由流动,从来都是一把双刃剑⑤一个原因就是这些国家尚不成
一根钢管,如果把它锯成4段,需要24分钟。照此速度,如果将它锯成8段,需要多长时间?( )
PaulJohnson’sAHistoryOfTheAmericanPeopleiswhatwehavecometoexpectfromthisproductivewriter—clear,colorfulnarra
A、Torunintoeachother.B、Togetbargains.C、Toavoidthecrowds.D、Tojointhecrowds.C对话中女士提到tobeatthecrowds(避开人群),选项[C]
最新回复
(
0
)