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
Scientists say there has been a severe decrease in the amount of water in Lake Chad in northern Africa in the last thirty years.
Scientists say there has been a severe decrease in the amount of water in Lake Chad in northern Africa in the last thirty years.
admin
2010-01-26
61
问题
Scientists say there has been a severe decrease in the amount of water in Lake Chad in northern Africa in the last thirty years. They report that nature and humans share, equal blame for this loss.
In 1963 the fresh water lake covered twenty - five - thousand - square kilometers. Now the lake is only about five percent of that size. It measures only about one - thousand - three - hundred square kilometers in the dry season.
Four nations surround Lake Chad. People in Niger, Nigeria, Chad, and Cameroon use it for water, fish and plant life.
Michael Coe and Jonathan Foley are water experts at the University of Wisconsin in Madison. They reported about Lake Chad in the Journal of Geophysical Research. They say the area has suffered from a lack of heavy rain for more than thirty years. This has forced people to build systems to carry water to dry land. These irrigation systems further decrease the lake.
Mister Coe says Lake Chad will be only a small body of water in the future. He says people still can get water from the lake to drink and for crops. But he says the lake will no longer provide a healthy environment for fish and plant life.
The researchers used a computer to study what caused the water loss. Their computer study estimated the climate and amount of water in the area. The estimate started with the early 1960s. Then the researchers compared the estimates with the area’s recorded climate and water supply for the same period.
The computer study showed results similar to the recorded ones for the first twenty years. But there was a big change in the 1980s. At that time, the lake got smaller much faster than the computer research had estimated.
The researchers say major irrigation systems were built in the 1980s. The systems took water from two rivers that flow into Lake Chad. The Chaff and Logone rivers carry most of the water that enters the lake. The study showed the increased irrigation reduced the flow in the two rivers. Climate changes also were responsible for the reduction. Today the flow of the two rivers has been reduced by almost seventy five percent.
Scientists say the problem is expected to worsen in the coming years as the population and demand for water continue to increase.
What is scientists’ attitude towards the future of Chad Lake?
选项
A、Pessimism.
B、Hopeful.
C、Indifferent.
D、Doubtful.
答案
A
解析
关键语句:“Scientists say the problem is expected to worsen in the coming years as the population and demand for water continue to increase.”且从贯穿全文的语气可以看出不抱乐观态度。
转载请注明原文地址:https://kaotiyun.com/show/vNdK777K
0
大学英语六级
相关试题推荐
Asanemployer,youshouldmakesureyourworkers(train)________onhowtodotheirworkwell.
Whyispropertrainingnecessaryforallofyouremployees?Becauseitwillreduce___________________andinjuries.
Manypeoplewhosepossessionsweredestroyedinnaturaldisasterseventuallyconsideredtheirloss______.Whatdoestheauthor
A、MajorEuropeanairlineswillgobankrupt.B、Europeanswillpaymuchlessfortraveling.C、Travelingtimebytrainbetweenmajo
A、Towinoverthemajorityofpassengersfromairlinesintwentyyears.B、ToreformrailroadmanagementinwesternEuropeancoun
A、Theyarequarrelling.B、Themanisbuyingagoodbook.C、Thewomanistryingtoknowthereason.D、Themanistryingtobuyso
Forthispart,youareallowedthirtyminutestowriteacompositiononthetopicMyViewonChoosingtheRightCareer.Youshou
A、Inaschoolzone.B、Inaresidentialdistrict.C、Inacommercialarea.D、Inthecountryside.CWheredothetwospeakersbegin
A、Heisaworker.B、Heenjoysmusic.C、HehasanotherplayerD、Helost20dollar.BWhatisprobablytrueabouttheman?
A、Prestigeschoolsmaynotbebetter.B、Thequalityisaboutthesameiseveryschool.C、Prestigeschoolsarealwaysthebest.D
随机试题
多年来理论界对组织冲突的看法褒贬不一,其中传统的观点认为冲突对组织有益,而且是无害的。()
Manypost-80scouplesarecomplainingthatgoingtothemovies,shoppingorattendingpartieshavebecomeimpossiblesincetheir
A.HBsAgB.HBeAgC.两者均是D.两者均否存在于小球形和管型颗粒中()
下述哪项生理活动改变是由仅受体介导的
女性,68岁。原有肺心病病史。受凉后发热伴咳脓姨,发绀加重,次日神志模糊,嗜睡,血压12.0/9.0kPa,无病理反射。血气分析检查结果为;pH7.56,PaO27.33kPa(55mmHg),PaCO29.33kPa(70mmHg),HCO3-
能与类风湿因子特异性结合的物质是
矿井遇到水害时的正确应急措施是()。
假定通用对话框的名称为CD1,命令按钮的名称为Command1,则单击命令按钮后,能使打开对话框的标题为“通用对话框”的事件过程是()。
在窗体中要显示一门课程的基本信息和选修该课程的学生,窗体设计时要在主窗体中显示课程的基本信息,在子窗体中显示选修该课程的学生名单,则主窗体和子窗体数据源之间的关系是
Democracyisnotanewconception.TheancientAthenians【M1】______hadademocraticsystem.TheirdemocracywasthesameasAme
最新回复
(
0
)