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
外语
Desertification in the arid United Statse is flagrant. Groundwater supplies beneath vast stretches of land are dropping precipit
Desertification in the arid United Statse is flagrant. Groundwater supplies beneath vast stretches of land are dropping precipit
admin
2011-04-26
93
问题
Desertification in the arid United Statse is flagrant. Groundwater supplies beneath vast stretches of land are dropping precipitously. Whole river systems have dried up. Others are chocked with sediment washed from denuded land. 21.
Hundreds of thousands of acres of previously irrigated cropland have been abandoned to wind or weeds. Several million acres of natural grassland are eroding at unnaturally high rates as a result of cultivation or overgrazing. All told, about 225 million acres of land are undergoing severe desertification.
22.
Federal subsidies encourage the exploitation of arid land resources. Low-interest loans for irrigation and other water delivery systems encourage farmers, industry, and municipalities to mine groundwater. Federal disaster relief and commodity programs encourage arid-land farmers to plow up natural grassland to plant crops such as wheat and, especially cotton. Federal grazing fees that are well below the free market price encourage overgrazing of the commons.
The market, too, provides powerful incentives to exploit arid land resources beyond their carrying capacity. 23.
When commodity prices are high relative to the farmer’s or rancher’s operating costs, the return on a production-enhancing investment is invaribly greater than the return on a conservation investment. And when commodity prices are relatively low, arid land ranchers and farmers often have to use all their available financial resources to stay solvent.
24.
If the United States is, as it appears, well on its way toward overdrawing the arid land resources, then the policy choice is simply to pay now for the appropriate remedies or pay far more later, when productive benefits from arid land resources have been both realized and largely terminated.
选项
答案
如果商品价格高于农场主或牧场主的经营成本,那么旨在增加产出的投资的回报永远大于自然资源管理投资的回报。如果商品价格比较低,干旱地区的牧场主和农场主则往往必须耗尽所有的财力,以免负债。
解析
转载请注明原文地址:https://kaotiyun.com/show/TE6O777K
0
考博英语
相关试题推荐
Readtheinformationaboutthecommunicationofinformationinbusiness.ChoosethecorrectwordtofilleachgapfromA,BorC
ReadthememoandtheCVofanapplicationbelow.Completethecandidateinformationthatfollows.Writeawordorphrase(inCA
Dysonvacuumcleanersarenotlikeothercleaners.JamesDysonbelievesthatwearingasuithelpsyouthinkcreatively.
HowtoChangeCareersSuccessfullyStep1:Spendsomequalitytimeselectinganewcareer.Nooneknowswhatyouwantfroml
HowtoChangeCareersSuccessfullyStep1:Spendsomequalitytimeselectinganewcareer.Nooneknowswhatyouwantfroml
Wearetoldthatthemassmediaarethegreatestorgansforenlightenmentthattheworldhasyetseen;thatinBritain,forinst
1.AmericanhopesthatpressurefromtheUSwillforceJapantosuddenlydismantleitstradeharriersarealmostcertaintoeva
DearSirs,IamwritingtoyourofficetoattempttodeterminewhyIhaveencouragedsomanyobstaclestoreceivingmyproper
摩天大搂、高速公路、小轿车和市场上品种繁多的家用电器,这一切都说明中国自1978年实行改革开放以来经历了深刻的变化。这是人们能够亲眼看见的变化。然而,在人们物质生活变化的背后,还有其他一些可能是具有更重要意义的变化。社会学家们发现,随着人们生活水平的提高
现在,成千上万的美国人沉湎于对身材苗条的追求之中。他们着迷于节食和,锻炼,这不仅仅是因为他们对年轻外表的追求。最近的一项研究表明了节食和体育锻炼对身体健康极端重要。如同在许多工业技术发达的国家一样,北美人的生活方式发生了显著的变化。现代化的机器完成了人们曾
随机试题
焊工操作时,不准穿有铁掌的皮鞋或布鞋。()
系统的特征不包括()
普通凝固性坏死与干酪样坏死在光镜下的主要区别是:
在直流电场中进行的免疫双扩散称为
成人外周血涂片中出现有核红细胞常见于
在冻胀、强冻胀、特强冻胀地基上,下列防冻害措施中正确的是()。
混凝土实体检验的主要检验项目是()。
()应当对国家级风景名胜区的规划实施情况、资源保护状况进行监督检查和评估,对发现的问题应当及时纠正、处理。
体操规则规定,男子单杠的高度为3.05米。()
南京国民政府时期形式意义上的最高权力机关的常设机关是()。
最新回复
(
0
)