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
28
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
Metal,ironinparticular,isknowntobeanimportantmaterialinbuilding.A、大家
[audioFiles]audio_etoefz_055(20051)[/audioFiles]A、Hohasnotbeentothenewre
Whichofthefollowingstatementsistrueaccordingtowhatyouhear?[br][ori
胎儿腹裂超声图像特征是A.双侧肾脏增大 B.膀胱增大 C.羊水减少 D.肠
导游资格考试合格的人员可通过全国旅游监管服务信息系统向所在地旅游主管部门申请导游
内源性高三酰甘油血症A.I型 B.Ⅱ型 C.Ⅲ型 D.Ⅳ型 E.Ⅴ型
关于竞争性拮抗药的特点,不正确的是A.使激动药量-效曲线平行右移 B.对受体有
有“乐圣”之称的作曲家是() A、李斯特B、莫扎特C、贝多芬 D、肖邦
()负责超额配售选择权的行使和股票的配售。A:承销团B:发行人的董事会秘书C
某矿副井井筒工程项目,井筒净径6.5m,井深726m,井筒穿越地层为第四系、白垩
最新回复
(
0
)