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
The long, wet summer here in the northeastern U.S.notwithstanding, there’s a world shortage of pure, fresh water.As demand for w
The long, wet summer here in the northeastern U.S.notwithstanding, there’s a world shortage of pure, fresh water.As demand for w
admin
2015-05-29
65
问题
The long, wet summer here in the northeastern U.S.notwithstanding, there’s a world shortage of pure, fresh water.As demand for water hits the limits of finite supply, potential conflicts are brewing between nations that share transboundary freshwater reserves.
Many people ask why we cannot simply take it from the sea, using our sophisticated technology of desalinization.But a good water supply must be hygienically safe and pleasant tasting and water containing salt would corrode machinery used in manufacturing in addition to producing chemical impurities.Since more than 95% of our water sits in the salty seas, man is left to face the reality that most water on the surface of the earth is not available for us.
One very feasible way of sustaining our supply of freshwater is to protect the ecology of our mountains.Mountains and water go together, a fact to which Secretary General Kofi Annan has drawn attention more than once.From 30% to 60% of downstream fresh water in humid areas and up to 95% in arid and semi-arid environments are supplied by mountains.Without interference nature has its own way of purifying water-even though chlorination and filtration are still necessary as a precaution.In a mountainous area, aeration, due to turbulent flow and waterfalls, causes an exchange of gases between the atmosphere and the water.Agriculture, industry, hydroelectric generators and homes that need water to drink and for domestic use depend on these resources and, thus, we must protect mountainous areas as a means of survival.
The author believes that industry avoids salt water because______.
选项
A、water is needed for livestock
B、crops must be considered before man-made products
C、it is used in desalinization plants
D、it causes corrosion
答案
D
解析
从第2段可知,海水腐蚀生产设备。因此D项为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/3YLO777K
0
考博英语
相关试题推荐
Theageatwhichyoungchildrenbegintomakemoraldiscriminationsaboutharmfulactionscommittedagainstthemselvesorothers
Nowadays,withplentifuliceandelectricchurning,fewpeoplerecallthesharedexcitementoftheerawhenmakingicecreamwasa
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand1
ItwasanormaldayinthelifeoftheAmericanRedCrossinGreaterNewYork.First,partofabuildingonWest140thStreet,i
Mostofustelloneortwoliesaday,accordingtoscientistswhostudythesethings.Andwerarelygetcaught,becausethelie
Englishremainsadominantanduniversallanguage,whichpresently【51】asaconnection-linkbetweengreatvarietiesofdif
The______amongsttheworld’sscientistsisthattheworldislikelytowarmupoverthenextfewdecades.
Mostofustellonetwoliesaday,accordingtoscientistswhostudythesethings.Andwerarelygetcaught,becausetheliesw
Theenergycontainedinrockwithintheearth’scrustrepresentsanearlyunlimitedenergysource,butuntilrecentlycommercial
“日本是关系社会而不是人与人之间相互影响的社会,”他说道,“一个人无法用电视讲话或一些笼统的提议来改变这样一种体制,无论电视讲话和提议的用意是多么的好。”
随机试题
可靠性试验对轮胎气压有什么规定?
患者,女性,31岁,车祸造成多发性损伤。急诊护士首先要处理的是
《土地管理法》规定:“城市市区土地属于国家所有。”这里所说的城市包括城市郊区。()
在真空中波长为λ的单色光,在折射率为n的均匀透明介质中,从A点沿某一路径传播到B点,如图2-47所示,设路径的长度l。A、B两点光振动相位差记为△φ,则()。
图示桁架有()根零杆。
单位建筑工程概算包括( )。
在某建筑工地上,施工单位与周边居民产生民事纠纷,双方同意采用行政调解解决,该项调解应当由下面哪个单位主持比较合适()。
债券持有人可按自己的需要和市场的实际状况,灵活地转让债券,以提前收回本金和实现投资收益。()
市场经济中最基本的市场是()。
Whichfacilityisnotavailableintheapartmentbuilding?
最新回复
(
0
)