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
26
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
A、Theauthorisoptimistic.B、Theauthorispessimistic.C、Theauthorisaggressive.D、Theauthorisambitious.A文中最后一句提到"there
Ahundredyearsagoitwasscientifically"proved"byeconomiststhatthelawsofsocietymadeitnecessarytohaveavastarmy
Inthedevelopedcountries,thedominantfactorinthenextsocietywillbesomethingtowhichmostpeopleareonlyjustbeginni
A、BecauseDiegocamefromafamousfamily.B、BecauseDiegowashighlyintelligent.C、BecauseDiegowasamanwithagreatfortun
A、HethinksDavidisnotreliable.B、He’swillingtotrustDavid.C、HehastoldhisdoubtstoDavid.D、HethinksDavidwillbene
AMOMENT’SINATTENTIONCAUSESACCIDENTSisaself-defeatingwarningbecause______.Whichofthefollowingstatementsisbetter
AlthoughBeethovencouldsitdownandcomposeeasily,hisreallygreatcompositionsdidnotcomeeasilyatall.Theycosthima
AlthoughBeethovencouldsitdownandcomposeeasily,hisreallygreatcompositionsdidnotcomeeasilyatall.Theycosthima
Henryhaspreparedapartyforhisgirlfriend,______(结果却被告之她到时候不能来了).
A、Apersonwhoarefamiliarwithfishkeeping.B、Apersonwhocanworkwithlargeaquaticappliances.C、Apersonwhoishard-wor
随机试题
高压系统短路电流的计算条件不适用于低压网络短路电流的计算。()
背景碾压混凝土坝是采用碾压土石坝的施工方法,使用干贫性混凝土修建的混凝土坝,是混凝土坝施工的一种新技术:碾压混凝土筑坝技术是世界筑坝史的一次重大冲突。20世纪60年代,世界各国开始碾压混凝土的试验研究。1981年,日本建成世界第一座碾压混凝土坝—
下列关于国有独资公司组织机构的表述中,符合《公司法》规定的是()。
如图16所示的水平地面上,一个底面积为0.16m2、重为4000N的物体,在2000N的水平推力作用下,8s内匀速前进了10m。求:推力在这8s内对物体做了多少功?
日食:日全食:日偏食
结合材料,回答问题:材料1小学老师雷夫.艾斯奎斯在其所著的热门教育畅销书《第56号教室的奇迹》中讲过这样一个故事:一位从事特殊教育的优秀教师获得一个宝贵的签名球,上面有关国著名棒球队——红袜队1967年全体队员的签名。这些球员
Hypertensionisthemedicaltermforpersistentandsustainedhighbloodpressure.Itisoneofthemost(51)formsofheartdis
A、Becausehedoesnotthinkitisworthwhiletohislife.B、Becausehedoesnotbelieveinthosetelevisionprograms.C、Because
Asfarasweareconcerned,youcangowheneveryouwant.
Whilethemissionofpublicschoolshasexpandedbeyondeducationtoincludesocialsupportandextra-curricularactivities,the
最新回复
(
0
)