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
23
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)
Whatheexpressedasameresuppositionwastakenbyothersasapositivestatement.
Someresearchersfeelthatcertainpeoplehave______nervoussystems,particularlytohot,drywinds.Theyarewhatwecallwea
Idon’tmindabitifyoubringyourfriendsinforadrink,butitisrathertoomuchwhensixteenpeoplearrive______fordin
It’saseriouscrimethatpeople______goodsoutofChinatoavoidpayingcustomsduty.
TheEnglishlanguagecontainsa(n)______ofwordswhicharecomparativelyseldomusedinordinaryconversation.
Agoodmodernnewspaperisanextraordinarypieceofreading.Itisremarkablefirstforwhatitcontains:therangeofnewsfro
Doyouagreeordisagreewiththefollowingstatement?Peopleareneversatisfiedwithwhattheyhave.Theyalwayswantsom
Acorpsofso-calledbarefootdoctorsaretrainedinhygiene,preventivemedicine,acupuncture,androutinetreatmentofcommon
Beforethemid-nineteenthcentury,peopleintheUnitedStateeatmostfoodsonlyinseason.Drying,smoking,andsaltingcould
随机试题
巨人症及肢端肥大症常见于哪种类型垂体腺瘤
机械制图的剖面图分为()。
在肾小球滤液中几乎没有蛋白质,原过滤膜上的孔()(1995年)
以下因素与特发性血小板减少性紫癜发病无关的是
利多卡因不能用于局部麻醉。()
某市的读书月活动提出,文化强市从阅读开始。建设文化强市过程中,读书的意义不可替代。强调读书的文化意义,是因为()。①文化在人民大众的生活中占据主导地位②先进文化是文化和社会发展的根本动力③文化为社会发展提供精神动力和智力支持④文化影响人的实践、
《礼记.中庸》中描述的“博学之,审问之,慎思之,笃行之”是指现代教育论中的()。
下列证据中,属于直接证据的是()。
在当代资本主义生产自动化条件下,剩余价值的源泉是
A、8.B、7.C、5D、9A题目询问男士能在运动场待多长时间。上午9点到下午5点共8个小时,所以选A(8小时)。
最新回复
(
0
)