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
61
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
(far)more
解析
由文章可知树木有时消耗的水分比所留下的多得多。
转载请注明原文地址:https://kaotiyun.com/show/4ckK777K
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
Tomcantaketheradioapartandthenputitbacktogetheragain.Icertainlywishhe_______mehow.
Youshouldn’t_______yourfather’sadvice.Anywayheismuchmoreexperiencedthanyouinthismatter.
A.informedB.careerC.presentingD.relevantE.successfulF.effortG.remindedH.consideringI.deliberatelyJ.stress
A.informedB.careerC.presentingD.relevantE.successfulF.effortG.remindedH.consideringI.deliberatelyJ.stress
InternationalDiningEtiquette1.AsiaRulesofusingchopsticksRestthemonaplateora【T1】______Avoidtorestthem【T2】_____
FindingYourExcellence:BecomingWhoYouAre1.Be【T1】______【T1】______■Giveeffortand【T2】______t
Abovethetreesarethehills,_______magnificencetheriverfaithfullyreflectsonthesurface.
VolcanoesAvolcanoisanopeninginaplanet’ssurfaceorcrust,/whichallowslava,ashandgasestoescapefromthep
CreatingaLow-carbonSocietyInrecentyears,low-carbonlifestyleisvigorouslyadvocatedaroundtheworld.Eachandevery
Instead,I’11______onthedifferencesbetweenthetwoversions;unfortunatelymostofthedifferencestookawayfromtheorigin
随机试题
个人与社会的关系是人生道路上的基本关系。试述个人在社会生活中应该怎样认识和处理个人与社会的关系。
若f(x)在x0点连续,则f(x0+2h)=[].
视椎细胞属于
承包商应在已经察觉或理应察觉索赔事由发生后一定期限内,向业主或设备监理工程师递交索赔意向通知书,表明承包商就该索赔事由期望得到业主给予补偿的要求为()。
自动程序设计的实现途径有四种方式,其中对于所有满足条件的输入,要求定理证明程序证明存在一个满足输出条件的输出,从该证明中析取出所有欲生成的程序,一般称这种方法为()。
杂交水稻是通过基因重组改变水稻的基因来提高产量的。()
这段文字中首句的空缺处应以下列哪一项填入:文中处被抽取出来的一项内容应该是:
______是目前理论界较公认的创造性思维的核心。
设函数y1(x),y2(x),y3(x)线性无关,而且都是非齐次线性方程(6.2)的解,C1,C2为任意常数,则该非齐次方程的通解是
Somepeople’searsproducewaxlikebusylittlebees.Thiscanbeaproblemeventhoughearwax(耳垢)appearstoserveanimportant
最新回复
(
0
)