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
考研
The Excrement Pollutes Nearly 40 years after the first Earth Day, this is irony: The United States has reduced the manmade p
The Excrement Pollutes Nearly 40 years after the first Earth Day, this is irony: The United States has reduced the manmade p
admin
2013-04-03
33
问题
The Excrement Pollutes
Nearly 40 years after the first Earth Day, this is irony: The United States has reduced the manmade pollutants that left its waterways dead, discolored and occasionally flammable . But now, it has managed to smother the same waters with the most natural stuff in the world. Animal manure, a byproduct as old as agriculture, has become a modern pollution problem, scientists and environmentalists say. The country simply has more dung than it can handle: Crowded together at a new breed of big farms, livestock produce three times as much waste as people, more than can be recycled as fertilizer for nearby fields.
That excess manure gives off air pollutants, and it is the country’s fastest-growing large source of methane, a greenhouse gas. And it washes down with the rain, helping to cause the 230 oxygen-deprived "dead zones" that have boosted along the U.S. coast. In the Chesapeake Bay, about one-fourth of the pollution that leads to dead zones can be traced to the back ends of cows, pigs, chickens and turkeys. The reasons for manure’s rise as a pollutant have to do, environmentalists say, with a shift in agriculture and a soft spot in the law.
In recent decades, livestock raising has shifted to a smaller number of large farms. At these places, with thousands of hogs or hundreds of thousands of chickens, the old self-contained cycle of farming-manure feeds the crops, then the crops feed the animals— is overwhelmed by the large amount of waste. The result in farming heavy places has been too much manure and too little to do with it. In the air, that extra manure can dry into dust, forming a "brown fog". It can emit substances that contribute to climate change. And it can give off a smell like a punch to the stomach. "You have to cover your face just to go from the house to the car," said Lynn Henning, 52, a farmer in rural Clayton, Mich. , who said she became an environmental activist after smoke from huge new dairies gave her family headaches and burning sinuses.
In the water, the chemicals in manure don’t poison life, like pesticides or spilled oil. Instead, they create too much life, and the wrong kinds. The chemicals in manure serve as fertilizer for unnatural algae blooms. They drain away oxygen as they decompose. resulting increasing number of suffocating dead zones.
The chemicals in manure in the water contribute to______.
选项
答案
unnatural algae blooms
解析
根据题于关键词chemicals,in manure定位到第四段第三句:Thechemicals in manure serve as fertilizer for unnatural algae blooms.可知,动物粪便中的化学成分能造成异常藻类植物的繁殖。
转载请注明原文地址:https://kaotiyun.com/show/wPd4777K
0
考研英语一
相关试题推荐
Alan"Ace"GreenbergchosehisnicknametoimprovehischanceswithgirlsattheUniversityofMissouri.Butitisanapt(1)___
"Itshouldbepossibletomakeapreciousstonethatnotonlylooksliketherealthing,butthatistherealthing",saidache
The"explosiveconflict"inParagraph1refersto______.ThenumberofsalmoneveryspringinBritishColumbia’sriversfourye
Energywillbeoneofthedefiningissuesofthiscentury.Onethingisclear:theeraof(1)_____oilisover.Whatwealldon
Youareagraduatestudentwithmasterdegree,majoringinInternationalBusiness.Writealettertoacompanytoapplyforapo
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In(1)_____worldduringthe
WhentheVikingsinvadedGreatBritain,theydidmorethanslaughterthepopulation,ransackthecitiesandscorchtheearth.Th
Moreandmoreresidences,businesses,andevengovernmentagenciesareusingtelephoneansweringmachinestotakemessagesorgi
TheEuro’sfiscalstraitjacketismentionedtoshowItcanbesafelyconcludedfromthetextthatsmallermembersoftheEuroa
WhydidtheEUseldomfinancebasicscientificresearchinthepast?ERC’sultimatesuccessseemstoliein
随机试题
患者李某,男,61岁。因黏液血便2个月余入院,体检:体温37.9℃,脉搏90次/分,呼吸20次/分,血压130/80mHg。巩膜无黄染、心肺(-)、腹平软、肠鸣音为6~7次/分,自诉有便前腹痛,有时伴腹胀、肠鸣,大便软不成形每日3~5次,有里急后重感,无尿
A、固化时收缩B、固化期15分钟C、固化期轻膨胀D、与牙齿有化学结合E、固化时体积无变化玻璃离子粘固粉
A.药品广告B.广告C.广告发布者D.刑事责任E.广告内容
丁单位是实行国库集中支付的事业单位,20×2年9月,按照预算安排,丁单位拟采购一台纳入政府采购集中采购目录的仪器A设备用于药品检验,设备价款为200万元,由于A设备具有特殊性,只能从有限范围的供应商处采购,丁单位以投标邀请书的方式邀请了5家供应商参与投标,
企业资源优势具有()的特点,企业要不断投入以保持和创新其优势。
两个公司资产项目相同,A公司是全权益公司,发行在外的股票数是100亿股,股价24元,B公司发行在外股票数200亿股,并且以5%的利率借债1200亿元,请问该公司股价最接近()元。[上海财经大学2016研]
Ifnotproperly______,borderissueswhicharealwaysverysensitiveandcomplicatedinternationalrelationscanoftentriggerc
以下不属于选择旗帜广告提供商时主要考虑的要素是()。
BathBathbybusSeethesplendorofGeorgianBathfromanopen-topbus.Busesdepartevery10minutesandoperateonahopo
A、Theyusuallyconcentrateononeparticularfield.B、Theyhavemanycoursestochoosefrom.C、Theystudyvariouscoursesfroml
最新回复
(
0
)