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
2024-10-16
16
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/3803845.html
相关试题推荐
Whatisthethemeoftheforum?[originaltext]Aneconomicforum—onOpportu
Thedemonstrationisto______.[br][originaltext]Onthesecondanniversa
Thedemonstrationisto______.[originaltext]Onthesecondanniversaryof
Whywasthespeedlimitfirstreducedto55miles-per-hour?[br][originaltext]
Whywasthespeedlimitfirstreducedto55miles-per-hour?[originaltext]Acc
Thetwospeakersaremainlytalkingabout______.[br][originaltext]M:Hi,Jan
WhatdidIndonesiaandAcehrebelsdoonMonday?[br][originaltext]Indone
WhatdidIndonesiaandAcehrebelsdoonMonday?[originaltext]Indonesiana
WhyAmericanscientistsaredevelopingthesemaps7[br][originaltext]Americ
WhyAmericanscientistsaredevelopingthesemaps7[br][originaltext]Americ
随机试题
Acoupleofmonthsago,Iwenttoadepartmentstoretobuyafewthingsfor
[originaltext]TheUnitedStateshasproposedwithdrawingabout1/3ofAmeric
大力提倡教育“与其守成法,毋宁尚自然;与其求划一,毋宁展个性”的是()A.张之
消防设备末端配电装置的操作按钮保养中绝缘电阻()。A.不低于1Ω B.不低
下列关于注册会计师风险应对的相关说法中,不正确的有()。A.对计划获取控制运行的
A.双清口服液 B.葛根芩连丸 C.正柴饮颗粒 D.桂枝合剂 E.防风通
(2017年真题)假定年贴现率为6%,2年后一笔10000元的资金的现值为(
下列各项中,不属于现金流量表中经营活动产生的现金流量的有()。A.支付的借款利
根据《水电水利工程施工监理规范》(DL/T5111-2012),监理协调会议包括
患者,男性,11岁,不慎跌倒,手掌着地,查体:肘关节半屈状,肘部明显肿胀及压痛,
最新回复
(
0
)