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
29
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、small
B、equivalent
C、modest
D、maximum
答案
C
解析
考查上下文语义衔接。But提示所填词与stable形成转折关系,同时修饰agricultural yields"农业产量",与stable形成反义复现关系的只有small、modest两项,但small是"小的",不能修饰yield,产量低可以说low yield,所以只能选择modest"有限的,不大的"。equivalent"相当的,相等的",句中显然不具有比较之意;maximum"最高的,最大极限的"与语义相反。
转载请注明原文地址:https://kaotiyun.com/show/Yu44777K
0
考研英语一
相关试题推荐
Gentz,a34-year-oldGermanwhoisaco-founderofZalando—aEuropeancloneofZappos,theonlineUSshoesandfashionretailer
Writeanessaybasedonthefollowingbarchart.Inyourwriting,youshould1)interpretthechart,and2)giveyourcomments.
Britain’sflexiblelabormarketwasaboonduringtheeconomicrecession,helpingkeepjoblessnessdownandthen,whentherecov
Universityusedtobeforaprivilegedfew.Insomecountriesitisnowalmostariteofpassage.Althoughthatisexcellentnew
Manyexpertsbelievethatinthenewworldofartificialintelligence(AI)humanbeingswillstillbeneededtodothejobsthat
Internetadvertisingisbooming.Theindustryhasgonefrom$9.6billioninrevenuein2001to$27billionthisyear,according
Nameshavegainedincreasingimportanceinthecompetitiveworldofhighereducation.Ascollegesstriveformarketshare,they
Writeanessaybasedonthefollowingdrawing.Inyourwriting,youshould1)describethedrawingbriefly,2)explaintheinten
Fromthesecondparagraphwelearnthat______.Theauthor’sattitudetowardseuthanasiaseemstobethatof______.
ItcanbeinferredfromthesecondparagraphthattherecentrapiddevelopmentofIndianmodernartiscloselyassociatedwith_
随机试题
内伤腰痛的特点是
一般认为,甘草所含有效成分主要包括
糖尿病酮症酸中毒的诱因不包括:
评价组合业绩时,基于不同市场指数所得到的评估结果不同,不具有可比性。( )
某公司非常重视产品定价工作,公司负责人强调采用以市场需求为基础的定价方法,则可以采取的定价方法有()。
一件工作,甲、乙合做6天可以完成,乙、丙合做10天可以完成。如果甲、丙合做3天后,由乙单独做,还要9天才能完成。如果全部工作由3人合做,需几天可以完成?
马克思说,人“赋予物以有用的性质,好像这种有用性是物本身所固有的,虽然羊未必想得到,它的‘有用’性之一,是可作人的食物”。这说明
[*]
[*]
实时操作系统能够及时响应随时发生的外部事件,并在严格的【】范围内完成对该事件的处理。
最新回复
(
0
)