首页
登录
职称英语
[originaltext] Three-fourths of the world is covered with water. But only abou
[originaltext] Three-fourths of the world is covered with water. But only abou
游客
2024-01-21
7
管理
问题
Three-fourths of the world is covered with water. But only about 3% of it is fresh. All the rest is salt water, which fills the oceans and seas. (16)In history, men have tried to build their homes near the sources of fresh water. Now, fresh water is becoming rare, but more and more is needed because of the increasing number of people. Some industries also use large amounts of fresh water in the production of steel, paper, and so on. Scientists estimate that the need of fresh water will have doubled by the year 2050. If it is the truth, we must find new ways of saving or producing it. Some nations have worked on the problem and are already sharing their information with others. They are trying to keep their rivers from being polluted. Deep wells are also being dug, and rainwater is being collected in huge artificial lakes. In one way or another, they hope to provide enough water to satisfy the needs of their people. (17) One important way to have fresh water is to make it from seawater. In this process, the salty seawater is heated, leaving the salt. When the vapor (蒸汽) cools down, it becomes water again. (18)The great problem in desalting is not whether it works, but how much it costs. Building the plants is costly and so are the equipment and fuel for the process. One solution to the problem of the fresh water may be to construct companies with two purposes, that is, making fresh water and generating electricity.
16. Where did humans usually build their houses in the past?
17. How can scientists provide more fresh water for people?
18. What is the main problem in desalting water?
选项
A、Along big rivers.
B、Near the sources of rivers.
C、Near the sources of lakes.
D、Near the sources of fresh water.
答案
D
解析
短文中提到。历史上,人们一般把房屋建在能直接饮用的淡水源头附近。
转载请注明原文地址:https://tihaiku.com/zcyy/3380528.html
相关试题推荐
[originaltext](5)Almostallcompaniesrecognizetheimportanceofinnovati
[originaltext](1)TheInternationalLaborOrganizationsaysthenumberofp
[originaltext](5)UnderthelawinMassachusetts,tobaccocompanieshaveto
[originaltext](5)UnderthelawinMassachusetts,tobaccocompanieshaveto
[originaltext](5)UnderthelawinMassachusetts,tobaccocompanieshaveto
[originaltext]Longqueues,delayedflightsandovercrowdingatairportshav
[originaltext]Longqueues,delayedflightsandovercrowdingatairportshav
[originaltext][5]AtourboatturnedoveroffthecoastofNicaragua,killin
[originaltext][5]AtourboatturnedoveroffthecoastofNicaragua,killin
[originaltext][5]AtourboatturnedoveroffthecoastofNicaragua,killin
随机试题
[originaltext]Amidmajorcutstopublicfunding,politicalleadershavecit
A、Morecritical.B、Moretalkative.C、Gentleandfriendly.D、Strictandhard-work
TheLibraryofCongressisAmerica’snationallibrary.Ithas【B1】______ofbo
这个小岛位于城市的东南方向,面积20平方公里,人口3.8万,以其美丽的景色出名。Locatedinthesoutheastofthecity,the
A.腺嘌呤 B.5-羟色胺 C.去甲肾上腺素 D.乙酰胆碱 E.肾上腺素
下列关于城市规划实施的表述,哪项是错误的?()(2010年真题)A.编制控
根据社会服务机构内部的动态管理机制和过程,机构在推动内部各部门运作时,主要依靠对
肺痿的病因为( ) A.肺气不降 B.肺气虚冷 C.肺气壅盛 D.肺燥
()是指为担保债务的履行,债务人或者第三人不转移财产的占有,对一定期间内将
煤矿许用炸药包括()。A.被筒炸药 B.离子交换炸药 C.当量炸药 D.岩
最新回复
(
0
)