首页
登录
职称英语
How much of the earth’s water can man really use? [br] [originaltext] The w
How much of the earth’s water can man really use? [br] [originaltext] The w
游客
2023-11-15
47
管理
问题
How much of the earth’s water can man really use? [br]
The world is not only hungry, but thirsty for water. That may seem strange to you, since nearly 75% of the earth’s surface is covered with water. But about 97 % of this huge amount is sea water, or salt water. Man can only drink and use the other 3%-tile fresh water from rivers, lakes, underground, and other sources. And we cannot even use all of that, because some of it is in the form of icebergs and glaciers. Even worse, some of it has been polluted.
However, this small amount of fresh water is still enough for us. But our need for water is increasing rapidly. Only if we take steps to deal with the problem now can we avoid a severe world-wide water shortage later on.
One of the first steps is to develop ways of reusing it. Today water is used only once and then discharged into a sewer system, and it eventually returns to the sea or runs into underground storage tanks. But it is possible lo pipe used water to a purifying plant. There it can be filleted and treated with chemicals so that it can be used again.
But even if every large city purified and reused its water, we would still not have enough.
All we’d have to do to make use of the sea water in, the world is to remove the salt. If we take these steps we’ll be in no danger of drying up!
选项
A、Water can be used only once.
B、Used water can be recycled.
C、Recycled water is unfit for drinking.
D、Only rain water is drinkable.
答案
B
解析
录音稿:But it is possible to pipe used water to a purifying plant.There it can be filtered and treated with chemicals so that it can be used again.
转载请注明原文地址:https://tihaiku.com/zcyy/3189283.html
相关试题推荐
WhatchangeshappenedattheAcademyAwards?[br][originaltext]Thisyear,
WhatchangeshappenedattheAcademyAwards?[originaltext]Thisyear,somet
Whatisafrankfurter?[br][originaltext]Mostpeopleknowwhatahotdogis
Whatisafrankfurter?[br][originaltext]Mostpeopleknowwhatahotdogis
Whatisafrankfurter?[originaltext]Mostpeopleknowwhatahotdogis.It’s
Whatistheconversationmainlyabout?[br][originaltext]W:Dr.Smith?Thisis
WhichofthefollowingisCORRECTaboutthenewlibrary?[br][originaltext]M:
WhichofthefollowingisCORRECTaboutthenewlibrary?[br][originaltext]M:
TheJapanesebullettrains______.[br][originaltext]Foryearsnow,the
TherelationshipbetweenEuropeandIndiaisbasedon______.[originaltext]
随机试题
Allovertheworldmenaresearchingfornewtechniquestoprovidemasshous
Youshouldspendabout20minutesonthistask.Themapsillustratethechanges
Thespeakerannouncedthattherewasabigfireanddirected_____nearestthedoo
IfDOGiswrittenHSK,howwouldyouwritethecodewordforBAR?FEV如果dog写成hsk,那
评述布鲁纳的认知一发现说。
下列不属于人格类型内容的是()。A.乐观型、聪慧型、稳定型、恃强型 B.兴奋
贴面修复不适用于A.前牙四环素牙 B.前牙釉质发育不良 C.前牙切角缺损
市场交易中不准缺斤少两,以次充好,降低服务标准。这属于市场管理内容中对(
某建筑面积23000㎡的大型地下商场,耐火等级为一级,相邻区域确需局部连通时,不
女,4岁,颊面及近中 最可能诊断为( )。A.中龋 B.浅龋 C.深龋
最新回复
(
0
)