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
18
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
DearDiary,IHateYouReflection
Anewstudyusesadvancedbrain-scanningtechnologytocastlightontoatop
某高速公路施工合同,主要工程内容为:路基工程、桥梁工程和隧道工程。其中,路基工程
已知四维列向量线性无关,则下列向量组中线性无关的是
当设计无要求时,在240mm厚的实心砌体上留设脚手眼的做法,正确的是()。A
排水管道的坡度必须符合设计要求,严禁倒坡。
酶活性测定中,对米-曼氏常数(Km)的叙述,不正确的是A.Km作为酶的一种特征常
中期票据进行登记、托管、结算的单位是( )。A.亚洲投资银行 B.全国银行间同
目前银行理财产品的主体是( )理财产品。A.非保本浮动收益 B.保本浮动收益
2022年2月,某酒厂(一般纳税人)销售白酒和啤酒给副食品公司,其中白酒开具增值
最新回复
(
0
)