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
2024-02-07
61
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 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.(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 history?
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:http://tihaiku.com/zcyy/3430573.html
相关试题推荐
[originaltext]M:ImuchpreferMrs.Brown’slessons.I’vegotabookofnotesf
[originaltext]M:ImuchpreferMrs.Brown’slessons.I’vegotabookofnotesf
[originaltext]M:ImuchpreferMrs.Brown’slessons.I’vegotabookofnotesf
[originaltext]Thankyouforcoming,everyone.Today’spresentationwillsho
[originaltext]Accordingtoasurveyonreadingconductedin2001bytheUS
[originaltext]Accordingtoasurveyonreadingconductedin2001bytheUS
[originaltext]Farmington,Utah,isamorepleasantcommunitysincealocal
[originaltext]M:I’mphoningupaboutthisjobyouadvertiseinthispaper.Thi
[originaltext]M:WhatshouldIdoaboutMr.Romero?Remember?Hesaiditwasim
[originaltext]M:WhatshouldIdoaboutMr.Romero?Remember?Hesaiditwasim
随机试题
AlthoughFrench,German,AmericanandBritishpioneershaveallbeencredite
只要股指期货的市场价格偏离了其理论价格就存在套利的机会。()A、正确B、错误B在现实中,由于各种因素的影响,股票指数与期货指数都在不断的变
[originaltext]M:Icouldn’tputupwithmywifeanylonger.Idon’tknowwhysh
[audioFiles]audio_eufm_j55_001(20082)[/audioFiles]A、Hehadtocancelhisinterv
最适于制备缓、控释制剂的药物半衰期为A.48h
地下室底板防水工程施工期间,地下水位应降至防水工程底部最低标高以下至少()mm
当我们走到酒店门口时,门会自动打开,这是()在生活中的实际应用。A.感测技术
2020年1-12月份,全市固定资产投资3815.36亿元,同比增长6.1%。房
A. B. C. D.
企业的生产控制过程包括的主要阶段有()。A:设计生产能力 B:测量比较 C:
最新回复
(
0
)