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
Trees are useful to man in three important ways: they provide him with wood and other products: they give him shade:and they hel
Trees are useful to man in three important ways: they provide him with wood and other products: they give him shade:and they hel
admin
2016-03-11
34
问题
Trees are useful to man in three important ways: they provide him with wood and other products: they give him shade:and they help to prevent droughts and floods.
Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. In his eagerness to make money from trees, he has cut them down inlarge numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.
This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil — allowing the rain to sink in — and also bind the soil, thus preventing it from being washed away easily: but where there are no trees, the ran falls on hard ground and flows away, causing floods and canying away the rich top-soil. When all the top-soil is gone, nothing remains but worthless desert.
Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire. It set up the empire but, without its trees, its soil became poor and it grew weak. When the empire fell to pieces, the home country found itself faced with floods and starvation.
Why does land become desert after all trees are cut down?
选项
A、Because nothing remains on land except floods
B、Because there are no longer trees to keep the rain and protect the top-soil
C、Because too much rain sinks in and washes away the top-soil
D、Because roots of the trees break up the soil
答案
B
解析
事实细节题。第二段最后一句话提到当顶屋土壤被冲走,就只剩下沙漠。而土被冲走是因为没有森林保存雨水,所以选B。
转载请注明原文地址:https://kaotiyun.com/show/pjRO777K
0
成人本科学位英语
相关试题推荐
Throughoutthecolonialperiodtherewasaremarkableshortageofwomen,whichvariedwiththeregionsandwasalwaysgreatesti
Idon’toftenlosethingsandI’mespeciallycarefulwithmoney,soIwasquitesurprisedwhenIreachedformywalletanditwa
OnestudyshowsthatAmericansprefertoanswerwithabrief"Yes","No","Sure",ortheverypopular"Yeah"ratherthanwitha
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______inthelasttwen-tyyears.Themainchangehasbeen【
Inordertolearnaforeignlanguagewell,itisnecessarytoovercomethefearofmakingmistakes.Iftheprimarygoaloflangu
Whenitcomestoeatingsmartforyourheart,thinkingaboutshort-termfixesandsimplifylifewithastraightforwardapproac
SpeakerA:IheardJoesaysomethingterribletoyouyesterday.SpeakerB:______
Experiencedteachersmake______mistakesthanbeginners.
Asearlyas1647Ohiomadeadecisionthatfree,tax-supportedschoolsmustbeestablishedineverytown________50households
Throughouthistory,peoplehavebeenthevictimsofpickpockets.Today,pocket-pickingisoneofthemostrapidlyincreasingcri
随机试题
简述螺杆式制冷机的特点。
关于胸骨的描述正确的是
Littre疝
下列哪项是深入访谈的缺点
某女,50岁。头痛隐隐,遇劳发作,兼头晕,神疲乏力,面色不华,舌淡,脉细弱。其辨证为( )
有关儿童体格生长发育,正确的是
在教育史上提出“学而不思则罔,思而不学则殆”的教育家是()。
设z=z(x,y)是由确定的函数,求z=z(x,y)的极值点和极值.
Carservicingissomethingthateverycarownerhastoexperienceatleastsometimeoftheyear.Thebestmethodtoserviceyou
HolySquid!PhotosOfferFirstGlimpseofLiveDeep-SeaGiantLikesomethingstraightoutofaJulesVernenovel,anenormou
最新回复
(
0
)