首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
If you live in a city in North America or Europe, you have probably never thought much about water. Whenever you need some, you
If you live in a city in North America or Europe, you have probably never thought much about water. Whenever you need some, you
admin
2013-06-02
23
问题
If you live in a city in North America or Europe, you have probably never thought much about water. Whenever you need some, you turn on the tap and there it is. Millions of people in other parts of the world are not so lucky. They have trouble getting enough clean water for their basic needs. This situation may soon become common all around the world, scientists believe. In fact, they say that the lack of clean water may be one of the biggest issues in the twenty-first century.
The reasons for this are clear. On the one hand. people are using more water than ever before. Over the last fifty years, the population of the world has more than doubled. On the other hand, many sources of surface water such as rivers, lakes, and streams are too polluted and unhealthy for use as drinking water.
This has forced more and more people to drill wells so they can get water form underground. There are enormous amounts of water deep underground in lakes called aquifers. Until recently, scientists believed this underground water was safe from pollution. Then, in the 1980s. people in the United States began to find chemicals in their well water, and scientists took a closer look at what was happening. Weldon Spring, Missouri, for example, was the site of a bomb factory during World War Ⅱ. The factory was destroyed after the war. but poisonous chemicals remained on the ground. Very slowly, these chemicals dripped down through the ground and into the aquifer. Once they did, however, the water form that aquifer was no longer drinkable.
It probably never will be drinkable again, Underground water is not renewed regularly by the rain, like lake or river water. Thus, if a harmful chemical gets into an aquifer, it will stay there for a very long time. Furthermore, it is nearly imp6ssible to remove all the water in an aquifer and clean out the pollutants.
Industrial sites like Weldon Spring are one cause of underground water pollution. There are thousands of such sites in the United States alone, and many others around the world. Underground water pollution is also caused by modern farming methods, which require the use of large amounts of chemicals in the fields. And finally, yet another important cause of underground water pollution is waste. That includes solid waste thrown away in dumps and landfills, and also untreated human and animal waste.
The situation is indeed very serious. Fortunately, there are many aquifers and they are very large. Only a small number have been seriously damaged so far. But if the world does not want to go thirsty in the near future, further pollution must be prevented. Around the world, governments must make real changes in industry, agriculture, and waste disposal.
In Weldon Spring, people found ______.
选项
A、chemicals in well Water
B、many sources of surface water
C、more aquifers than other places
D、chemicals in the bomb factory
答案
A
解析
细节题。第三段中的“people in the United States began to find chemicals in their well water,...Weldon Spring,...,for example,..”说明美国科学家发现Weldon Spring这些地方的井水里有化学物质。因此正确答案为A项。
转载请注明原文地址:https://kaotiyun.com/show/Lu67777K
0
大学英语六级
相关试题推荐
Ahundredyearsagoitwasscientifically"proved"byeconomiststhatthelawsofsocietymadeitnecessarytohaveavastarmy
Forthispart,youareallowed30minutestowriteashortessayentitledOnRemedialExaminations.Youshouldwriteatleast15
A、BecauseshewantedtohurtDiego.B、Becauseshewastoldshelookedbetterinaman’ssuit.C、Becauseshewasanadvocateoft
A、Theworkersontheundergroundplatformswerereplacedbymachines.B、Itbecamethefirstcompletelyautomaticrailwayinthe
AdamRappoporthasthesamefamiliaritywithakeyboardaswellasthetouch-tonepadonthephone.Asasmartphone,Treo600
A、BehostiletoNancy.B、AskNancytocomeout.C、TalktoNancyherself.D、WriteNancyaletter.C选项都以原形动词开头表明,问题应属于“建议”类型。选项A不符
A、Travelingbytrain.B、Preparingforatrip.C、Makingashoppinglist.D、Shoppinginasupermarket.B对话中男士提到You’dbettertake…s
Haditnotbeenforthetrafficjam,___________________(我已经走完50英里了).
A、Hedidn’twanttowarmupforthegame.B、Hedidn’twanttobeheldupintraffic.C、Hewantedtomakesuretheygottickets.
北京是中国历史上的很多朝代的都城,许多游牧民族曾经在北京住过。今天,北京菜是由山东菜和御膳精制而成,并形成了其独特的特色。由于皇室的饮食习惯,许多北京菜主要是肉。例如。明代的蒙古统治者青睐羊肉,而清朝统治者更喜欢猪肉。北京厨师一般投入更多精力在烹饪方法上,
随机试题
西周在地方基层行政区划上都实行一种______管理体制。()
关于胎动不正确的是
下列对左旋多巴的叙述哪项是错误的
已知(X,Y)的联合概率密度则A=()。
所谓证券市场监管,是指证券管理机关运用法律的、经济的以及必要的行政手段,对证券的募集、发行、交易等行为以及证券投资中介机构的行为进行监督与管理。()
现代财政理论要求政府征税应避免对市场机制运行发生不良影响,即额外负担要小于额外收益,净收益应该为正,这体现了税收的()原则。
Utopia
设f(x)=处处可导,确定常数a,b,并求f’(x).
一个汉字的内码和它的国标码之间的差是()。
A、Gotothelibrary.B、Paythemoney.C、Gothroughregistration.D、Getachecklist-releasecard.C由女士的话可知,由于男士在图书馆的checklist中,只有
最新回复
(
0
)