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1、A Strong Greenhouse Gas 1.Methane is a colorless,odorless gas;it is also a potent greenhouse gas,and once released into the atmosphere,it absorbs heat radiating from Earths surface.That.s why methane is a major contributor to the planets increasing temperature riseor global warming.Molecule for mole
2、cule,methane.s heat-trapping power in the atmosphere is 21 times stronger than carbon dioxide,the most abundant greenhouse gas. 2.With 13 billion cows belching almost constantly around the world(100 million in the U.S.alone),its no surprise that methane released by livestock is one of the chief glob
3、al sources of the gas.Other prime methane sources： petroleum,drilling,coal mining,solid-waste landfills and wetlands. 3.Greenhouse gases like methane and carbon dioxide make up only a small part of Earths atmosphere,which is 78 percent nitrogen and nearly 21 percent oxygen.And without greenhouse gas
4、es to trap the sun.s heat and warm the planet,life was we know it couldnt exist.But in the last 200 years,human activity that requires burning oil,natural gas,and coal for energy has magnified the greenhouse effect. 4.Atmospheric concentrations of methane have more than doubled in the last two centu
5、ries.Blame for this often focuses on big industries and gas-guzzling vehicles.But agriculture plays a major role,too.In the past 40 years alone,the global cattle population has doubled. 5.Cows munch mostly grasses and hayyet they grow big and hefty.Why？ Because of the rumen.The rumen holds 160 liter
6、s of food and billions of microbes.These microscopic bacteria and protozoa break down cellulose and fiber into digestible nutrients.A cow couldnt live without its microbes.As the microbes digest cellulose,they release methane.The process occurs in all animals with a rumen(cows,sheep,and goats,for ex
7、ample),and it makes them very gassy.It.s part of their normal digestion process.When they chew their cud,they regurgitate some food to rechew it,and all this gas comes out.the average cow expels 600 liters of methane a day. 6.Thats why we say livestock gas is also a major factor of causing the globa
8、l warming. 词汇： methane 甲烷 munch 用力咀嚼 odorless 无味的 hefty 健壮的 potent 强有力的 rumen 瘤胃 belch 打嗝 protozoa 原生动物（复数) livestock 家畜，牲畜 cellulose 纤维素 landfill 埋填的废渣 nutrient 有营养的 magnify 扩大 cud 反刍的食物 guzzle 大量消耗（燃料等) regurgitate 反刍 注释： 1.once released into the atmosphere：一旦（甲烷)释放到大气中once released into the atmos
9、phere相当于once methane is released into the atmosphere. 2.Molecule for molecule，molecules heat-trapping power in the atmosphere is 21 times stronger than carbon dioxide：按分子与分子对比，甲烷在大气中吸热的能力比二氧化碳强20倍介词for表示“对比或比例关系”。 3.without greenhouse gaseslife as we know it couldnt exist：没有温室气体我们所知道的生命就不能生存。本句中，lif
10、e是主语。as从句中的it指代life. 4.Atmospheric concentrations of methane：甲烷在大气中的浓度。 练习： 1.Paragraph 1 _ 2.Paragraph 2 _ 3.Paragraph 4 _ 4.Paragraph 5 _ A.Life of Microscopic Bacteria in Livestocks Rumen B.Ways to Reduce Methanes Heat-trapping Power C.Agriculture Also Contributes to Increased Concentrations of M
11、ethane in the Atmosphere D.Why Livestock Releases Methane E.Methane as a Strong Greenhouse Gas F.Livestock as a Prime Factor of the Greenhouse Effect 5.Methane is _ to the intensifying greenhouse effect. 6.Greenhouse gases are indispensable to mankind,but the problem mankind is faced with is _. 7.Ge
12、nerally people heap criticism on _ for the planets temperature rise. 8.Nothing has been mentioned in the passage about _. A.one of the major contributors B.the ever-increasing atmospheric concentrations of greenhouse gases C.big and hefty cows D.livestocks normal digestion process E.how to cut down
13、the cattle populations F.big industries and gas-guzzling vehicles 答案与题解： 1.E本段的第三句点出了 methanes heat-trapping power in the atmosphere is 21 times stronger than carbon dioxide. 2.F本段要表达的中心意思是： livestock排出的甲烷也是温室效应的一个主要源头。 3.C本段表达的重点是用 but转折的段后两句。 4.D本段从科学的角度分析反刍动物为什么会释放出甲烷。 5.A，选A的依据在第一段的第二句和昀后一句。 6.B，选B的依据在第三段的第二句、第三句和第四段的第一句。这三个句子先后介绍了下列观点：没有温室气体，生物不能生存；人类燃烧能源，加剧温室效应；大气甲烷含量增加一倍。 7.F第四段第二句直接谈到这个问题。人们常常将不断加剧的温室效应归罪于大工业和汽车，而 cattle释放甲烷的因素被忽略了。 8.E，选项E是本文没有提到的内容，也就是说，其他五个选项的内容文章部有涉及。 相关推荐（注意按照ctl键点击可以查看链接）：职称英语每日一练 持续快速提分2014年职称英语网上辅导热招周涵2015年职称英语考试介绍及课程班次介绍免费试听 购买官网微信号：zhichengenglish
