首页
登录
职称英语
[originaltext] Three-fourths of the world is covered with water. But only ab
[originaltext] Three-fourths of the world is covered with water. But only ab
游客
2024-02-09
27
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. In the 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. 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. 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 men usually build their houses in history?
17. How can scientists provide more fresh water for people?
18. What is the main problem in desalting water?
选项
A、By mixing salt water with fresh water.
B、By producing more seawater.
C、By changing salt water into fresh water.
D、By adding certain amount of chemicals.
答案
C
解析
信息明示题。短文在讲科学家希望提供淡水以满足人们的需求时提到,其中一个途径就是从海水中提取淡水。
转载请注明原文地址:https://tihaiku.com/zcyy/3435050.html
相关试题推荐
[originaltext]MoreandmorepeopleareimmigratingintotheUnitedStates.
[originaltext]Insomecountriescertainkindsofinsurancearecompulsory.
[originaltext]Penurywaswhatpeoplecalledamysteryman.Wehadknownhim
[originaltext]Penurywaswhatpeoplecalledamysteryman.Wehadknownhim
[originaltext]M:Whatkindofprintsthatarepopularamongteenagers?Whichco
[originaltext]M:Whatkindofprintsthatarepopularamongteenagers?Whichco
[originaltext]M:Hi,Sarah,what’sup?W:Oh,hi.Ijustgotoutofahistoryc
[originaltext]M:Sally,howareyougettingalongwiththetranslationwork?W
[originaltext]M:Sally,howareyougettingalongwiththetranslationwork?W
[originaltext]M:Sally,howareyougettingalongwiththetranslationwork?W
随机试题
TheAmericanTaxSystemGovernmentsraiserevenuesthroughtax
MostofChina’sinternetusersgoonlinetochatorseekentertainmentrathe
Munich’sfirst"Oktoberfest"everwasheldin1810tocelebratearoyalwedd
StephenBrownhas"alwaysbeenfascinatedwiththeideaofaworld’sfair."M
关于选择装帧工艺材料的说法,错误的是( )。A.装帧工艺材料的选用直接影响书刊
下列关于商业银行信用风险控制措施的表述,正确的有()。A.限额管理是管理贷款集
患者,男,42岁。一周来入睡困难,甚至彻夜难眠,口苦心烦,舌质红,舌苔黄,脉弦数
治疗蛔厥证的首选方是A.追虫丸 B.化虫丸 C.乌梅丸 D.使君子散 E
在临床规范给药的情况下,较常见的"副作用"发生的主要原因是药物A.新药 B.中
按工作原理分类的泵有()。A.清水泵 B.离心泵 C.回转泵 D.往
最新回复
(
0
)