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
56
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
Wewerediscussingthehousingproblemwhenamiddle-agedmancutinandsaid,"There’snopointintalkingaboutimpossibilitie
Thedaybeforemyhistoryexam,Istillhadn’t______readingthefirstbookonthelist.
Itthispart,youareexpectedtowriteacompositionentitledPressuresonModernMeninnolessthan200words.Yourcompositi
TheEnglishlanguagecontainsa(n)______ofwordswhicharecomparativelyseldomusedinordinaryconversation.
Doyouagreeordisagreewiththefollowingstatement?Peopleareneversatisfiedwithwhattheyhave.Theyalwayswantsom
Sofarasthefoodindustryisconcerned,theprocessingofsheepandlambsisrelatively______intheUnitedStates,accountin
VeterantracktrainerJohnsonisscathinginhis______oftheleadersoftheI.O.C.,"Thesepeoplearemegalomaniacs.Theyare
StandardEnglishisthevarietyofEnglishwhichisusuallyusedinprintandwinchisnormallytaughtinschoolsandtonon-nat
【66】Astateuniversitypresidentwasarrestedtodayandchargedwithimpersonateapoliceofficerbecame,theauthoritiessay,h
NicholasChauvin,aFrenchsoldier,airedhisvenerationofNapoleonBonaparteso______andunceasinglythathebecamethelaug
随机试题
直流电动机的换向过程,是一个比较复杂的过程,换向不良的直接后果是()。
磁共振现象为成像技术提供了一种全新思路:将人体置于特殊磁场中,用无线电射频脉冲激发人体内氢原子核,引起氢原子核共振,并吸收能量;在停止射频脉冲后,氢原子核按特定频率发出射电信号,并将吸收的能量释放出来,被人体外的接收器收录,经电子计算机处理获得图像。许多
F公司是一家电子生产企业,厂区占地面积达2000m×1800m,厂区西南角有一个制氢站(下风向),占地约50m×60m。燃气锅炉房位于制氢站东650m,锅炉房内有3台额定功率为2.5MPa,额定蒸发量为10t/h的蒸汽锅炉(其中1台备用)。电镀车间紧邻锅
在防止事故发生的众多技术措施当中,能够从根本上防止事故发生固然是最好的,但受实际技术、经济条件的限制,有些危险源不能被彻底根除,这时应该设法限制它们拥有的能量或危险物质的量,降低其危险性。下列安全技术措施当中,不属于限制能量或危险物质的是(
“从后归类”的原则是进行商品归类时优先采用的原则。()
某建筑工程公司拟购买一物业进行经营,以补充工程任务不足时公司的正常运营。如果该物业有价值,则进行投资。根据调查、分析和市场预测,基本情况是:投入运营后初期投资约6.5亿元,该值将随着谈判的进程而逐步明确;运营期预计为50年,每年的销售收益可达2.8亿元,销
()是企业劳动安全卫生保护工作的职业道德行为准则。
现在我们常用“阳春白雪”和“下里巴人”指代高雅和通俗的文艺作品。请问这两个成语最初指的是()。
在市场经济条件下,能够引导市场自动调节供求关系,从而保证供需平衡的大致信号是()。
Perhapsmostimportant,thereportcould______morelight,thoughitdoesgivesome,onhowchildwelfareischangingovertime.
最新回复
(
0
)