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
The farm is a major marketplace for millions of tons of synthetic fertilizers and pesticides (杀虫剂),and advanced machinery and th
The farm is a major marketplace for millions of tons of synthetic fertilizers and pesticides (杀虫剂),and advanced machinery and th
admin
2013-06-10
76
问题
The farm is a major marketplace for millions of tons of synthetic fertilizers and pesticides (杀虫剂),and advanced machinery and the fuel required to run it. The modern super farm, large and highly capitalized, is resource dependent compared with the diversified small farms that were once dominant. On diversified farms, major energy needs may be supplied by resident humans and animals. Soil fertility may be maintained by alternating cash crops and restorative crops, and also by returning animal manure(肥料) to the soil. This farming model of relatively self- sufficient agriculture, and the way of life associated with it, are still economically viable(可行), as demonstrated by prosperous Amish farmers and other practitioners of "alternative" agriculture. Particularly relevant to today’s mainstream agriculture are the energy-saving practices on large "organic" farms, which are thoroughly mechanized but which minimize the use of pesticides and synthetic fertilizers.
By comparison, mainstream American agriculture has until lately been careless in its use of energy, water, and land. When fossil energy was cheap, applications of fertilizers and pesticides paid large dividends, so farmers were encouraged to use these products. Soon most farmers used too much fertilizer and pesticide. Farmers in dry regions enjoyed an era of cheap water, obtained from publicly subsidized irrigation systems or from pumping groundwater using, inexpensive energy. The soil too was expendable as demand grew for U.S. agricultural products.
The period of extraordinary profligacy in the use of soil, water, and fossil fuels may well be at an end. The new structure of large farms is quite sensitive to cost factors. These adaptive farms, whose development was assisted by public tax, subsidy, and research policies, have access to capital, technologies, and management skills, enabling them to switch relatively quickly to resource-conserving practices—for example, to a low-tillage system that requires less fuel, that shepherds soil moisture, and that may reduce soil erosion(侵蚀). It seems likely that federal programs that have enlarged our farms, therefore, have had a further result of creating the potential for a more conserving agriculture. With respect to energy use, for example, energy costs per unit of output are lower for large farms, mainly because these farms quickly economized on energy as costs rose. In the future, according to one authoritative assessment, "agricultural production is likely to use capital and land more intensively but energy, fertilizer and labor less intensively."
选项
A、their sizes
B、the machinery employed
C、the degree of dependence on resources
D、the kinds of crops cultivated and animals raised
答案
C
解析
第一段第二句指出,现代超级农场,规模宏大,高度资本化,与曾经占统治地位的综合农场相比,更依赖资源。
转载请注明原文地址:https://kaotiyun.com/show/U4d4777K
0
考研英语一
相关试题推荐
Whenlabratssleep,theirbrainsrevisitthemazetheynavigatedduringtheday,accordingtoanewstudy(1)_____yesterday,o
Whenlabratssleep,theirbrainsrevisitthemazetheynavigatedduringtheday,accordingtoanewstudy(1)_____yesterday,o
Whenlabratssleep,theirbrainsrevisitthemazetheynavigatedduringtheday,accordingtoanewstudy(1)_____yesterday,o
Whenlabratssleep,theirbrainsrevisitthemazetheynavigatedduringtheday,accordingtoanewstudy(1)_____yesterday,o
Whenlabratssleep,theirbrainsrevisitthemazetheynavigatedduringtheday,accordingtoanewstudy(1)_____yesterday,o
Whenlabratssleep,theirbrainsrevisitthemazetheynavigatedduringtheday,accordingtoanewstudy(1)_____yesterday,o
Whenlabratssleep,theirbrainsrevisitthemazetheynavigatedduringtheday,accordingtoanewstudy(1)_____yesterday,o
It’ssevenweeksintothenewyear.Doyouknowwhereyourresolutionis?Ifyou’relikemillionsofAmericans,youprobablyvow
It’ssevenweeksintothenewyear.Doyouknowwhereyourresolutionis?Ifyou’relikemillionsofAmericans,youprobablyvow
随机试题
设备分配应保证设备有高的利用率并应注意避免_______。
A.药品经营企业不得经营B.由国务院药品监督管理部门规定的药品批发企业经营C.由省级药品监督管理部门规定的定点药品批发企业经营D.应当具有保证供应责任区域内医疗机构所需麻醉药品和第一类精神药品的能力,并具有保证麻醉药品和第一类精神药品安全经营的管理制
A.旋光度B.沸点C.熔点D.折光率E.相对密度冰片(合成龙脑)所测定的物理常数是()
渗透性利尿药应具备下列哪些特点
进行接案面谈后,社会工作者要进行社会工作记录,其中比较常用的记录形式是( )。
汉字中有不少会意字,今人也可以结合个人的感悟进行新的理解。请仿照示例,从下列两个会意字中任选一字进行重新“会意”,写出两种不同的理解。舒:①只要不断地舍弃和给予,就会感到舒心。②舍予就是有一种忘我的精神,这种境界多么令人舒畅。
居民委员会、村民委员会设人民调解、治安保卫、公共卫生等委员会,其职责是()。
求
在考生文件夹下,打开文档WORD1.DOCX,按照要求完成下列操作并以该文件名(WORD1.DOCX)保存文档。将标题段文字(“赵州桥”)设置为二号红色黑体、加粗、居中、字符间距加宽4磅、并添加黄色底纹,底纹图案样式为“20%”、颜色为“自动”。
Whatarethespeakerstalkingabout?
最新回复
(
0
)