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 States is flagrant. Groundwater supplies beneath vast stretches of land are dropping precipit
Desertification in the arid United States is flagrant. Groundwater supplies beneath vast stretches of land are dropping precipit
admin
2013-01-15
55
问题
Desertification in the arid United States 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. 71.
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.
72.
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. 73.
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.
74.
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
照目前的样子,如果说美国正透支干旱地区的土地资源,那么应作出的决策是现在要为适当的补救措施付出代价,甚至往后还要付出更大的代价,因为从干旱的土地资源中获得的生产性利润不仅已经实现,而且在很大的程度上走向枯竭。
解析
转载请注明原文地址:https://kaotiyun.com/show/K79O777K
0
考博英语
相关试题推荐
Onanaverageofsixtimesaday,adoctorinHollandpractices"active"euthanasia:intentionallyadministeringalethal(致死的)
Throughthediscussiontheygainedanextraordinaryinsightintothecomplexityofwomen’semotions.
Whatheexpressedasameresuppositionwastakenbyothersasapositivestatement.
Agoodmodernnewspaperisanextraordinarypieceofreading.Itisremarkablefirstforwhatitcontains:therangeofnewsfro
Inconclusion,walkingisacheap,safe,enjoyableand______availableformofexercise.
Thesolutionwassimple:gasthebuildingwithahallucinogenandputtheterroriststosleepbeforetheycould______thebombs
Pleasewritealetterinabout150Englishwordsinthefollowingcondition:Asacommoncitizen,youwritealettertocall
Aseriesofborderincidentsinevitablyledthetwocountriestowar.
on9December,JamesJoyceexperiencedoneofthosecoincidenceswhichaffectedhim______atthetimeandwhichlaterbecamema
Nosoonerhadthemandepartedthanthetreebegandroppingcoffeebeans
随机试题
简述科举取士制度对我国语言文字的负面影响。
下列选项中,不属于口腔健康教育实施目的的是
患者,男,49岁。反复双下肢浮肿1年,加重2个月。水肿从眼睑逐渐发展到双下肢,按之凹陷不起,伴心悸,腰部冷痛,自觉小便量减少,神疲乏力,舌质淡胖,苔白,脉沉细或沉迟无力。尿常规:尿蛋白(++++)。24小时尿蛋白定量4.1g/24h。肝肾功能:血清白蛋白2
医德修养的根本途径是
请综合我国宪法修正案的最新修订,简要分析我国对私有财产的保护问题。
构成房屋工程造价的是()。
计算工程索赔时最常用的一种方法是()
关于税务师可提供涉税服务业务的说法,错误的是()。
内画壶原是鼻烟壶的一种,因在透明玻璃瓶内壁作画,故称“内画”。()
备课要做好三方面的工作:一是钻研教材;二是了解学生;三是设计教法。()
最新回复
(
0
)