首页
登录
职称英语
One day, drought may be a thing of the past, at least in any country not too
One day, drought may be a thing of the past, at least in any country not too
游客
2023-12-24
53
管理
问题
One day, drought may be a thing of the past, at least in any country not too far from the sea. Vast areas of desert throughout the world may for the first time come to life and provide millions of hectares of cultivated land where now nothing grows.
By the end of this century this may not be mere speculation. Scientists are already looking into the possibility of using some of the available ice in the Arctic and Antarctic. In these regions there are vast ice-caps formed by snow that has fallen over the past 50,000 years. Layer upon layer of deep snow means that, when melted, the snow water would be pure, not salty as sea-ice would be. There is so much potential pure water here that it would need only a fraction to turn much of the desert or poorly irrigated parts of the world into rich farmland. And what useful packages would come in! It should be possible to hack off a bit of ice and transport it! Alternatively perhaps a passing iceberg could be captured. They are always breaking away from the main caps and floating around, pushed by currents, until they eventually melt and are wasted.
Many icebergs are, of course, much too small to be towed any distance, and would melt before they reached a country that needed them anywhere. It would be necessary to harness one that was manageable and that was big enough to provide a good supply when it reached us. Engineers think that an iceberg up to 11 kilometres long and 2 kilometres wide could be transported if the tug pulling it was as big as a supertanker! Even then they would cover only 32 kilometres every day. However, once the iceberg was at its destination, say at one end of Hong Kong harbour, more than 7,000 million cubic metres of water could be taken from it! That would probably be more than enough for Hong Kong even in the hottest summer! But no doubt a use could be found for it.
Apparently, scientists say, there would not be too much wastage in such a journey. The larger the iceberg, the slower it melts, even if it is towed through the tropics. This is because when the sun has a bigger area to warm up, less heat actually gets into the iceberg. The vast frozen center would be unaffected.
Even with the giant tug that would have to be available to tow an iceberg seven miles long, the voyage would take many months from the Antarctic to Hong Kong, for example, but as stronger engines are built and more is known about sea currents, the journey could get shorter and shorter and thus the wastage less and less. Airline pilots have learnt to use jet streams ten miles above the earth to increase speed and save fuel so, surely, a boat towing an iceberg could make use of fast-flowing currents and avoid warmer water. [br] The difficulty of using ice to solve the drought problem lies in all of the following EXCEPT______.
选项
A、the proper equipment for transportation
B、the time taken on the journey
C、the storage of the fresh water
D、the proper size of icebergs
答案
C
解析
这是道细节题。这道细节题需要通读文中好几段才能找出。所以考生需要通读这几段。 “Engineers think that an iceberg up to 11 kilomctres long and 2 kilometres wide could be transported if the tug pulling it was as big as a supertanker!”(关键词11 kliometers,transport)“The larger the iceberg, the slower it melts, even if it is towed through the tropics.”“The vast frozen center would be unaffected. Even with the giant tug that would have to be available to tow an iceberg seven miles long, the voyage would take many months from the Antarctic to Hong Kong, for example.”(关键词:take many months)从三个句子可以看出,文中提到解决干旱碰到困难在于A:适当的运输设备,B:运送时间,D:适当的保留住冰块。唯独没有提及C。
转载请注明原文地址:https://tihaiku.com/zcyy/3300173.html
相关试题推荐
WhenIfirstcametothiscountry,IthoughtlittlethatIshouldstayheresol
Someobserverssaytherecentcoupofamilitarygovernmentinthatcountrywill
In1986thecountryinitiatedrestrictionsontheuseofpesticides.A、instituted
Heavyrainswerecausinginundationandmuchdamagethroughoutthecountry.A、muc
Itwastheir______decisiontoleavetheircountry,andasaresult,theylostth
Hewasonlya(n)________rulerofthecountry;therealonewashismother,who
Asthecrisisissweepingacrossthecountry,manyyoungpeople,especiallycoll
Thiscountry,withitsinstitutions,belongstothepeoplewhoinhabitit.Whene
Itisreportedthatalmost66%ofthelandinthewesternpartofthecountryar
Itwasherviewthatthecountry’sproblemshadbeenexacerbatedbyforeignaid,
随机试题
Inthevideo,themayordidallthefollowingEXCEPT[br][originaltext]The
Thisfeverwillreturnfromtimetotime,ifitfollowsitsusual______.A、patte
慢性肾小球患者的血压应控制在()mmHg以下.
下列哪种板材隔绝空气声的隔声量最大?()A.140陶粒混凝土板(238kg/
玻璃砖隔墙砌筑中与基体结构连接()。A.必须打胶 B.必须埋设拉结筋 C.
教师知识水平与教师专业发展水平一致。()
基金职业道德修养的具体内容是( )。A.基金职业道德教育 B.基金职业道德规
招标项目属于建设施工的,投标文件的内容应当包括()。A、拟派出的项目负责人与主
叉车是工程和物流企业广泛使用的搬运机械,各运行系统和控制系统的正确设置时其安全可
美国建筑师学会(AIA)的合同条件体系包括()。A.发承包人之间的合同文件
最新回复
(
0
)