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
Conventional wisdom says trees are good for the environment. They absorb carbon dioxide—a greenhouse gas—from the atmosphere and
Conventional wisdom says trees are good for the environment. They absorb carbon dioxide—a greenhouse gas—from the atmosphere and
admin
2012-02-12
67
问题
Conventional wisdom says trees are good for the environment. They absorb carbon dioxide—a greenhouse gas—from the atmosphere and store it as carbon while releasing oxygen, a process for which forests have been called "the lungs of the planet". The roots of trees have been thought to trap sediments and nutrients in the soil. Trees have also been credited with steadying the flow of these rivers, keeping it relatively constant through wet and dry seasons, thus preventing both drought and flooding. It is all nonsense, concludes a research published this week. A four-year international study led by researchers at the University of Newcastle, in Britain, and the Free University of Amsterdam, identifies several myths about the link between forests and water. For example, in arid and semiarid areas, trees consume far more water than they trap. And it is not the trees that catch sediments and nutrients, and steady the flow of the rivers, but the fact that the soil has not been compressed.
The World Commission on Water estimates that the demand for water will increase by around 50% in the next 30 years. Moreover, around 4 billion people—one half of the world’s population—will live in conditions of severe water stress, meaning they will not have enough water for drinking and washing to stay healthy, by 2025.
The government of South Africa has been taking a tough approach to trees since it became the first to treat water as a basic human right in 1998. Trees lose water through evaporation (the technical term is transpiration) at twice the rate of grassland or South Africa’s unique fynbos scrubland. In a scheme praised by the hydrologists, the state penalizes forestry companies for preventing this water from reaching rivers and underground aquifers.
In India, large tree-planting schemes not only lose valuable water but complicate the true problem identified by the hydrologists; the unregulated removal of water from aquifers to irrigate crops. Fanners need no permit to drill a borehole and, as most farmers receive free electricity, there is little economic control on the volume of water pumped. In the Kolar district in Karnataka, wells have dried up as the water table has plummeted from six metres to 150 metres below ground. Summary:
It is commonly believed that trees are good for the environment, as they absorb carbon dioxide and release oxygen; the roots of trees can trap water and【41】______ the flow of rivers. However, a recent study has found that this belief is【42】______.
According to the research, trees lose【43】______ water through evaporation than they trap. In South Africa, forestry companies are punished as the trees they planted prevented water from【44】______rivers and underground aquifers. In India, farmers drilled many wells and used the underground water to【45】______their farmland. This has lowered water table to 150 metres below ground. Many trees have been planted and in fact these trees complicate the existing problem.
选项
答案
irrigate
解析
在印度人们用地下水来灌溉农田。
转载请注明原文地址:https://kaotiyun.com/show/ickK777K
本试题收录于:
D类竞赛(专科)题库大学生英语竞赛(NECCS)分类
0
D类竞赛(专科)
大学生英语竞赛(NECCS)
相关试题推荐
Aftertheearthquake,anewnuclearstationwasputup_______therehadoncebeenafarm.
______moreimportant,notonlythelostcitieswererecovered,butthenewcitieswerebuilt.
With_____exceptions,theformerpresidentdoesnotappearinpublicnow.
A.incomeB.polarizationC.transformationsD.oldE.changesF.worseG.relaxedH.therebyI.divisionJ.accompanying
Studentsindifferentcountriespaydifferentattentiontophysicalactivities.Lookatthefollowingchartcarefullyandwrite
Lookatthepicturecarefullyandwriteyourresponseinabout200words,inwhichyoushouldstartwithabriefdescriptionof
A、Becauseshewasnotaconventionalwoman.B、Becauseshewantedtohelppeople.C、Becauseshewantedpeaceintheworld.D、Beca
A.absorbsB.attemptC.misleadingD.rewardingE.dimensionF.pervasiveG.uni-direc
(1)DenzelWashingtonandHalleBerrymadehistorySundaywithAcademyAwardwins,andformany,itwasasweetvictory,longpas
Turninyourcollectionofindustry-suppliedfreebiesandGoodmanwillsendbackafewreplacementpensbearingtheNoFreeLunc
随机试题
证据收集的主要方法有哪些?
发生光化学烟雾时受害者常见症状为
建筑安全监督管理机构应当对工程:
浸水路堤填筑的压实质量应符合设计要求,基床以下路基浸水与不浸水部分分界高程的施工允许偏差为()mm。
对于成套或中间设备供货商的资格预审应特别关注其()。
保险中介的作用在于()。
(凡要求计算的项目,除特别说明外,均须列出计算过程,计算结果出现小数的,均保留小数点后两位小数,凡要求编制会计分录的,除题中有特殊要求外,只需写出一级科目)A股份有限公司(以下简称A公司)为增值税一般纳税人,增值税税率为17%(凡资料中涉及的其他企业,需
不得颁发导游证的情形有()
《全国现代农作物种业发展规划(2012一2020年)》指出,我国农作物种业发展尚处于初级阶段,与发展现代农业的要求还不相适应。关于我国农作物种业存在的问题,下列说法错误的是()。
在Windows2003中安装FTP服务,需在“应用程序服务器”选项的(1)组件复选框中选择“文件传输协议(FTP)服务”进行安装。(1)备选答案:A.ASP.NETB.Internet信息服务(IIS)C.应用程序服务器
最新回复
(
0
)