首页
登录
职称英语
Scientists say there has been a severe decrease in the amount of water in Lak
Scientists say there has been a severe decrease in the amount of water in Lak
游客
2024-06-12
39
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 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. [br] Which of the following is true according to this passage?
选项
A、Chad Lake located in the middle of Chad in northern Africa.
B、The water from Chad water can now only be used for irrigation.
C、The area around Chad Lake has suffered from heavy rain lack many decades.
D、Population around the Chad Lake now begins to decrease due to water lack.
答案
C
解析
关键语句:“They say the area has suffered from a lack of heavy rain for more than thirty years.”因此C选项正确。而因文中“Four nations surround Lake Chad.”判断A错误;由“He says people still can get water from the lake to drink and for crops.”判断B错误;由“Scientists say the problem is expected to worsen in the coming years as the population and demand for water continue to increase,”判断D错误。
转载请注明原文地址:https://tihaiku.com/zcyy/3630192.html
相关试题推荐
ScientistssaytherehasbeenaseveredecreaseintheamountofwaterinLak
ScientistssaytherehasbeenaseveredecreaseintheamountofwaterinLak
[originaltext]Asisknowntoall,scientistsandphilosophershadstudiedt
[originaltext]Asisknowntoall,scientistsandphilosophershadstudiedt
[originaltext]Asisknowntoall,scientistsandphilosophershadstudiedt
[originaltext]Americanscientistsaredevelopingmapsthatcanidentifyare
Theyperseveredintheirresearch,______(无论情况多么不利).nomatterhowadverse/unfav
[originaltext]Ateamofscientistsrecentlybeganaprojecttomeasurethe
[originaltext]Ateamofscientistsrecentlybeganaprojecttomeasurethe
ManyleadingscientistssownthroughtheyearsfromGalileotoEinsteinhave
随机试题
CanTeachingGrammarReallyBeFun?【T1】________among
《工伤保险条例》规定,用人单位应当按时缴纳工伤保险费。职工个人应缴纳工伤保险费。
以下各种关于图形元件的叙述,正确的是()。A.图形元件可重复使用 B.图形
A.肾上腺素B.麻黄碱C.多巴胺D.去甲肾上腺素E.多巴酚丁胺鼻黏膜和牙龈出血的
如果护士发现医生医嘱有疑问时应当( )。A.执行医嘱 B.修改医嘱 C.报
关于计量型控制图的说法,正确的有()。 A.X—R,控制图控制成本低
以内涵划分概念,有( )A.集合概念 B.抽象概念 C.普遍概念 D.实
(2017年真题)下列关于证券投资组合的表述中,正确的有( )A.两项证券的收
取可靠系数为1.2,返回系数为0.85。分别计箅过电流保护和无时限电流速断保
下列各项中不属于传染病基本特征的是 A.有病原体 B.有传染性 C.有流行
最新回复
(
0
)