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
One billion people in the world are short of water. How can this problem be solved? Some suggestions have been to desalinate(除去盐
One billion people in the world are short of water. How can this problem be solved? Some suggestions have been to desalinate(除去盐
admin
2014-01-13
76
问题
One billion people in the world are short of water. How can this problem be solved? Some suggestions have been to desalinate(除去盐分)ocean water or to build enormous water pipelines from areas where water is abundant. Suggestions such as these prove extremely costly when they are actually used. One possibility that scientists are considering is pulling icebergs from either the North Pole or the South Pole to parts of the world with a water shortage. Although many questions must be answered before such a project could be tried, moving icebergs seems a reasonable possibility in the future.
Engineers, mathematicians, and glaciologists(冰川学家)from a dozen countries have been considering the iceberg as a future source of water. Saudi Arabia is particularly interested in this project because it has a great water shortage. Scientists estimate that it would take 128 days to transport a large iceberg(about 1/2 miles square)to Saudi Arabia. Yet the iceberg would be completely melted by the 104th day. Therefore, insulation would be essential, but how to insulate the iceberg remains an unsolved problem.
The problems in transporting an iceberg are numerous. The first problem is choosing the iceberg to pull. The icebergs that form in the North Pole are quite difficult to handle because of their shape. Only a small portion extends above the water — most of the iceberg is below the surface, which would make it difficult to pull. South Pole icebergs, on the other hand, are flat and float like table tops; thus, they would be much easier to move.
How can a 200 million-ton iceberg be moved? No ship is strong enough to pull such enormous weight through the water. Perhaps several ships could be used. Attaching ropes to an iceberg this size is also an enormous problem. Engineers think that large nails or long metal rods could be driven into the ice. What would happen if the iceberg split into several pieces during the pulling? Even if an iceberg with very few cracks were chosen, how could it be pulled through stormy waters? Furthermore, once the iceberg reached its destination, very few ports would be deep enough to store it.
All of these problems must be solved before icebergs can become a reasonable source of water. Yet scientists estimate that it will be possible to transport them in the near future. Each year, enough icebergs form to supply the whole world with fresh water for a full year. In addition, icebergs are free and nonpolluting. As a solution to the world’s water problems, icebergs may be a workable possibility.
Icebergs from the South Pole probably are easier to transport because______.
选项
A、most of the icebergs are below the surface
B、they are flat and float like table tops
C、only a small portion shows above the water
D、they are closer to the areas that need water
答案
B
解析
细节事实题。根据题干关键词Icebergs from the South定位到原文第三段尾句。are flat and floatlike table tops与选项B重现。故答案为B。
转载请注明原文地址:https://kaotiyun.com/show/vihO777K
0
考博英语
相关试题推荐
Weallhaveoffensivebreathatonetimeoranother.Inmostcases,offensivebreathemanatesfrombacteriainthemouth,althou
Thirty-onemillionAmericansareover60yearsofage,andtwenty-ninemillionofthemarehealthy,busy,productivecitizens.By
ManycountrieswillnotallowcigaretteadvertisingintheirnewspapersoronTV——especiallysincetheadvertisementsareusuall
Isawatelevisionadvertisementrecentlyforanewproductcalledanairsanitizer.Awomanstoodinherkitchen,sprayingthe
ThefoundersoftheRepublicviewedtheirrevolutionprimarilyinpoliticalratherthaneconomicorsocialterms.Andtheytalke
Resistancetothe1954UnitedStatesSupremeCourtdecisionterminatingsegregationplacedtheschoolsinthemiddleofahitter
AnOhioStateUniversitystudyhaslinkedbehaviorinyoungchildren【C1】______thetypeofjobtheirmotherhas.Motherswithcom
Radiationoccursfromthreenaturalsources:radioactivematerialintheenvironmentsuchasinsoil,rock,orbuildingmaterial
Manycriticsofthecurrentwelfaresystemarguethatexistingwelfareregulationsfosterfamilyinstability.Theymaintainthat
Afewminutesago,walkingbackfromlunch,IstartedtocrossthestreetwhenIheardthesoundofacoindropping.Itwasn’tm
随机试题
Mycatwouldnothavebittenthetoyfish______itwasmadeofrubber.
关于腮腺炎性睾丸炎描述正确的是
技术高度密集型行业一般属于()市场。
下列情况中,投资方应采用权益法核算长期股权投资的有()。
教师在讲解杜甫的《咏怀古迹》(其三)的时候,让同学们在课后找出几首怀古咏史诗进行比较阅读。下列作品不符合要求的是()。
对于输电线路,当P2R+Q2X>0时,首端电压()末端电压。
3,3,6,24,()。
在生产力不发达的时代,战争成为争夺资源的最重要的方式。青年是战争中最重要的参与者,而要赢得战争的胜利,青年人必须有强健的身体素质。为了取得战争的胜利,各城邦青年组织起来进行训练。作为全希腊的盟主,雅典城邦在全盛期有25万人口。而同时期的科林斯有9万人口,有
(2014年)设f(χ)是周期为4的可导奇函数,且f′(χ)=2(χ-1),χ∈[0,2],则f(7)=_______.
DSS的驱动模式是
最新回复
(
0
)