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
2013-01-20
51
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
以往浇灌过的成千上万英亩的庄稼地受到风和杂草的侵袭。由于耕种和过度放牧的缘故,数百万英亩的天然牧场正以惊人的速度遭到侵蚀,总共约有二亿二千五百万英亩的土地正经受着严重的沙漠化。
解析
转载请注明原文地址:https://kaotiyun.com/show/Sa2O777K
0
考博英语
相关试题推荐
(66)Astateuniversitypresidentwasarrestedtodayandchargedwithimpersonateapoliceofficerbecame,theauthoritiessay,
Futuristshaveidentifiedtwochangesthatseemtobecentraltocontemporarysociallife.First,theUnitedStatesisbeingres
Eventhoughwehadbeentoherhouseseveraltimesbefore,westilldidnotremember_____.
Achildhearshismothertonguespokenfrommorningtillnightinits_____form.
AnyDemocraticpresidentwilltryto______theUnitedStatesfromthemessinIraq,yetallwouldfacerigidconstraints.
A、showedB、demonstratedC、illustratedD、explainedA本题考核的知识点是动词。看主语,看宾语,看搭配。本题测试点为动词词义辨析。A、B、C项都有“显示”的意思,但是有些区别。B项意为“表明”,C项意为“举例说
Thefamousinventorwasawardedan______doctoratebytheuniversity.
Myfriend’sson,whoisasoldier,wasdelightedwhenhewas_____onlyafewmilesfromhome.
TheUniversityintransformation,editedbyAustralianfuturistsSohailInayatullahandJenniferGidley,presentssome20highly
Customerexperienceistheinternalandsubjectiveresponsecustomershavetoanydirectorindirectcontactwithacompany.71
随机试题
A.归心经B.归肝经C.归脾经D.归肺经E.归肾经杏仁能治疗胸闷喘咳,具有止咳平喘之功,其归经是
急性胰腺炎患者腹痛的特点是
建设项目中间评价通常也称为()。
企业发生的下列交易或事项中,引起资产和负债同时增加的有()。
社会资源的配置的基本方式有()。
在课堂教学中,吕老师会建议学生通过做笔记的方式保持对学习内容的专注度,同时吕老师也发现在讲解的过程中.学生用笔尖指着地图上的山脉河流,效果会比自己自始至终讲要好很多。这体现了对学生()的引起和保持。
韦纳将人们活动成败的原因归结为6个因素,其中属于自身内在因素的是()
县级以上地方人民政府公安机关和公安分局内设机构分为()。
Thousandsofteachersattheelementary,secondary,andcollegelevelscantestifythattheirstudents’writingexhibitsatende
LearningthroughTestsTakingatestisnotjustapassivemechanismforassessinghowmuchpeopleknow,accordingtonewre
最新回复
(
0
)