首页
登录
职称英语
The long, wet summer here in the northeastern U.S. notwithstanding, there’s
The long, wet summer here in the northeastern U.S. notwithstanding, there’s
游客
2025-04-02
20
管理
问题
The long, wet summer here in the northeastern U.S. notwithstanding, there’s a world shortage of pure, fresh water. As demand for water hits the limits of finite supply, potential conflicts are brewing between nations that share transboundary freshwater reserves.
Many people ask why we cannot simply take it from the sea, using our sophisticated technology of desalinization. But a good water supply must be hygienically safe and pleasant tasting and water containing salt would corrode machinery used in manufacturing in addition to producing chemical impurities. Since more than 95% of our water sits in the salty seas, man is left to face the reality that most water on the surface of the earth is not available for us.
One very feasible way of sustaining our supply of freshwater is to protect the ecology of our mountains. Mountains and water go together, a fact to which Secretary General Kofi Annan has drawn attention more than once. From 30% to 60% of downstream fresh water in humid areas and up to 95% in arid and semi-arid environments are supplied by mountains. Without interference nature has its own way of purifying water — even though chlorination and filtration are still necessary as a precaution. In a mountainous area, aeration, due to turbulent flow and waterfalls, causes an exchange of gases between the atmosphere and the water. Agriculture, industry, hydroelectric generators and homes that need water to drink and for domestic use depend on these resources and, thus, we must protect mountainous areas as a means of survival. [br] By saying that nature "has its own way of purifying water"(Line 5, Para. 3)the author is referring to______.
选项
A、aeration
B、filtration
C、chlorination
D、absorption
答案
A
解析
本题中大自然净化水源的方式指的是后文提到的充气。因此A项为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/4023287.html
相关试题推荐
Thelong,wetsummerhereinthenortheasternU.S.notwithstanding,there’s
Thelong,wetsummerhereinthenortheasternU.S.notwithstanding,there’s
Thelong,wetsummerhereinthenortheasternU.S.notwithstanding,there’s
Thelong,wetsummerhereinthenortheasternU.S.notwithstanding,there’s
Thelong,wetsummerhereinthenortheasternU.S.notwithstanding,there’s
Thelong,wetsummerhereinthenortheasternU.S.notwithstanding,there’s
Kunmingisusuallycoolinthesummer,butShanghai______.A、israrelyB、ishardl
PresidentBushcametohisparent’scentury-oldsummerhomeontheMainecoastf
EveryonehasbeentryingtounderstandMichaelJackson’sdeaththissummer.W
EveryonehasbeentryingtounderstandMichaelJackson’sdeaththissummer.W
随机试题
根据相关标准,危险化学品分为物理危险、健康危害及环境危害三大类。下列不属于物理危
关于健康的说法正确的是A.健康指的是没有疾病 B.健康指的是心理健康 C.健
下列选项对汉代音乐发展论述错误的是()。A.秦朝时期就已经建立了乐府 B.著名
Thechangeinthatvillagewasmiraculou
被认为是较为理想的取代注射给药的全身给药途径是A、皮肤给药 B、口腔黏膜给药
经启用后不能维持24小时内有效的物品是()。A.开启过的无菌包 B.铺好的无菌
政府对一些高档奢侈品和资源性消费品征收消费税,引导消费方向,节约资源、保护生态环
仅附金融票据,不附带商业单据的托收方式为( )。A.跟单托收 B.出口托收
下列各项所得,不属于“综合所得”的是()。A.工资、薪金所得 B.劳务报
已知光缆中带实芯锎线的直流试验电压为2000V,开通140Mb/s数字通信系统远
最新回复
(
0
)