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
52
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、diversion
B、diversity
C、disease
D、specialization
答案
B
解析
考查上下文语义衔接和近义词辨析。该选项所在的句子包括三个并列的小句,讲了现代化农业的经营,意思上也是顺承的关系,从前面的句子和后面的句子可以推断该选项的意思。另外,下面句中diversification也是对该选项的一个重要提示,不过名词词形变化了。diversity是"多样性",符合文意;而diversion意思是"转移,转换",disease是"疾病",specialization是"特殊化,专门化"。
转载请注明原文地址:https://kaotiyun.com/show/8u44777K
0
考研英语一
相关试题推荐
Aneweconomicspaperhassomeold-fashionedadviceforpeoplenavigatingthestressesoflife:Findaspousewhoisalsoyourb
Aneweconomicspaperhassomeold-fashionedadviceforpeoplenavigatingthestressesoflife:Findaspousewhoisalsoyourb
China’sventurecapitalpartymaybeabouttogetquiet.Thisyear,forthefirsttime,Chinesestart-upsraisedmorecashthan
Earlierthismonth,researcherBeaverofFloridaStateUniversityreportedthatheandhisco-authorshadidentifiedgeneticmar
Economictheorysuggeststhatregionalinequalitiesshoulddiminishaspoorerplacesattractinvestmentandgrowfasterthanric
TheUKgovernment’sdecisiontoshutterplanstobuildtheworld’sfirsttidallagoonoffSwanseaBayisahardblowforWales.
Poets,songwritersandpoliticianshatetheidea,butfordecadesopinion-pollevidencehasbeenclear;moneybuyshappinessand
Theword"schism"(Line3,Paragraph1)inthecontextprobablymeans______.Paragraphs2and3arewrittento______.
ItcanbeinferredfromthesecondparagraphthattherecentrapiddevelopmentofIndianmodernartiscloselyassociatedwith_
Forme,scientificknowledgeisdividedintomathematicalsciences,naturalsciencesorsciencesdealingwiththenaturalworld
随机试题
教师的进修提高以()。
行政机关对政府信息不能确定是否可以公开时,应当如何处理?()
()是以学校为本、基于学校的实际状况、为了学校的发展而由学校自主开发的课程。
《母婴保健法》实施起始的时间是
痰热咳嗽主证为风燥咳嗽主证为
促性腺激素分泌最多见于
信息是有生命周期的,在生命周期内,信息有效。为保证信息有效,要求配备有快速传递信息的通道,同时也要求信息流经处理的道路最短,而且中间的停顿最少。这体现了信息的()。
防火阀的设置部位不包括()。
在世界政治多极化发展趋势中,中、美、俄、日以及欧盟五大力量之间的相互关系是()。
收入分配是直接关系老百姓“钱袋子”的大事。关于收入分配,下列说法错误的是:
最新回复
(
0
)