首页
登录
职称英语
Scientists say there has been a severe decrease in the amount of water in La
Scientists say there has been a severe decrease in the amount of water in La
游客
2024-08-23
19
管理
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 reported that nature and humans share equal blame for this loss.
In 1963, the fresh-water lake covered 25, 000 square kilometers. Now the lake is only about five percent of that size. It measures only about 1, 300 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, water experts at the University of Wisconsin in Madison, reported on Lake Chad in a science journal. 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 amount of lake water.
Mr. 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 written records from 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 the time, the lake got smaller much faster than the computer research had estimated.
The researchers say that major irrigation systems were built in the 1980s. The systems took water from two rivers that flow into Lake Chad. The Chari and Logone rivers carry most of the water that enters the lake. The study showed that the increased irrigation reduced the flow in the two rivers. Climate changes also were responsible for the reduction. The flow of the two rivers was 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 continued to increase. [br] The water from Lake Chad is no longer environmentally appropriate for______.
选项
答案
fish and plant life
解析
(第五段最后一句指出But he says the lake will no longer provide a healthy environment for fish and plant life.“乍得源的水不再供给鱼类和植物生命。”)
转载请注明原文地址:https://tihaiku.com/zcyy/3731860.html
相关试题推荐
ScientistssaytherehasbeenaseveredecreaseintheamountofwaterinLa
警方会竭尽全力将这起犯罪案件调查到底。(persevere)Thepolicewillpersevereintheireffortstoinve
In1964,asevereearthquakeoccurrednearAnchorage,Alaska.Itwasreportedto
Accordingtoscientists,youngpeople’stastebudsarenotreadyforthebit
Accordingtoscientists,youngpeople’stastebudsarenotreadyforthebit
Accordingtoscientists,youngpeople’stastebudsarenotreadyforthebit
______,themoreseverethewintersare.A、ThemorenorthyougoB、Thefartheryo
Whendoesthesongbirdperformatapdance?[originaltext]Scientistshavediscov
Ihadhopedtofinishreadingby6:00butlookingattheamountofbookswaiting
Whatdiscoverymakesthescientistssurprising?[originaltext]Theburnedremains
随机试题
OralPresentationOneofthewaysthatteachersuset
WhodoInternationalmedicalguidelinescallfortouseacombinationofAIDSdr
下列关于专利导航基本流程的说法不正确的有()。A.技术分解可以根据具体需求制定,
专业术语“质量”一般包括“明确要求的质量”和()。A.未明确要求的 B.质量
患者,男,46岁,农民,近三年一直腹胀,面色萎黄,夜间常有阵发性哮喘,入院前3天
患者男,31岁。驾车坠入河中,被救起后送当地县医院。入院诊断:①左胸3、4、5、
(2018年真题)违反法律、行政法规或者中国证监会有关规定,情节严重的,可以对有
丹痧发热与出疹的关系表现是()A.发热1~2天出疹 B.发热数小时~1天
申请人在行政复议过程中,有以下哪些权利?()A.查阅行政复议机关所持有的所有涉
安全管理检查评定内容中,保证项目包括()。A.安全检查 B.安全教育 C.分
最新回复
(
0
)