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
Many people consider the wider use of biofuels a promising way of reducing the amount of surplus carbon dioxide (CO2n) being pum
Many people consider the wider use of biofuels a promising way of reducing the amount of surplus carbon dioxide (CO2n) being pum
admin
2011-02-25
59
问题
Many people consider the wider use of biofuels a promising way of reducing the amount of surplus carbon dioxide (CO
2
n) being pumped into the air by the world’s mechanized transport. The theory is that plants such as sugar cane, maize (corn, to Americans), oilseed rape and wheat take up CO2 during their growth, so burning fuels made from them should have no net effect on the amount of that gas in the atmosphere.
Theory, though, does not always translate into practice, and just as governments have committed themselves to the greater use of biofuels, questions are being raised about how green this form of energy really is. The latest comes from the International Council for Science (ICSU) based in Paris.
The ICSU report concludes that, so far, the production of biofuels has aggravated rather than ameliorated global warming. In particular, it supports some controversial findings published in 2007 by Paul Crutzen of the Max Planck Institute for Chemistry in Germany. Dr. Crutzen concluded that most analyses had underestimated the importance to global warming of a gas called nitrous oxide (N
2
nO). The amount of this gas released by farming biofuel crops such as maize and rape probably negates by itself any advantage offered by reduced emissions of CO
2
n.
Although N
2
nO is not common in the Earth’s atmosphere, it is a more potent greenhouse gas than CO
2
n and it hangs around longer. The result is that, over the course of a century, its ability to warm the planet is almost 300 times that of an equivalent mass of CO
2
n.
N
2
nO is made by bacteria that live in soil and water and, these days, their raw material is often the nitrogen-rich fertiliser that modern farming requires. Since the 1960s the amount of fertiliser used by farmers has increased sixfold, and not all of that extra nitrogen ends up in their crops. Maize, in particular, is described by experts in the field as a “nitrogen-leaky” plant because it has shallow roots and takes up nitrogen for only a few months of the year. This would make maize (which is one of the main sources of biofuel) a particularly bad contributor to global N
2
nO emissions.
But it is not just biofuels that are to blame. The ICSU report suggests N
2
nO emissions in general are probably more important than had been realised. Previous studies, including those by the International Panel on Climate Change (IPCC), a United Nations-appointed body of experts, may have miscalculated their significance — and according to Adrian Williams of Cranfield University, in Britain, even the IPCC’s approach suggests that the global-warming potential of most of Britain’s annual crops is dominated by N
2
nO emissions.
Scientists realize that maize
选项
A、contributes little to global N
2
nO emissions.
B、absorbs nitrogen very efficiently in crops.
C、is largely responsible for the surplus N
2
nO.
D、may experience a bad harvest for bacteria.
答案
C
解析
事实细节题。由题干关键词scientists, maize将信息定位于倒数第二段后两句。由该处可知,玉米是一种“漏氨”的作物,它是N
2
nO排放的一大罪魁祸首。故 [C]正确。[A]与[C]相反,故错误;[B]也与原文中“漏氨”的说法矛盾,故错误;[D]“可能因为细菌而歉收”,原文未提及。
转载请注明原文地址:https://kaotiyun.com/show/DOZ4777K
0
考研英语一
相关试题推荐
Youhearagreatmanycomplaintstodayabouttheexcessivesecurityconsciousnessofouryoungpeople.Mycomplaintisthe(1)__
Youhearagreatmanycomplaintstodayabouttheexcessivesecurityconsciousnessofouryoungpeople.Mycomplaintisthe(1)__
Google,thedominantInternetsearchcompany,isplanningtoraisethestakesinitsintensifyingcompetitionwithYahooandMic
TheimplicationofthesecondparagraphisthatAbrahamLincoln______ThehabitofreflectionhelpedLincoln______
FrederickII’sexperimentwas______Themostprobablereasonforsomechildrenbackwardinspeakingis______
(46)Basedonaccumulatedsocialresearch,therenowcanbelittledoubtthatsuccessfulandwell-adjustedchildreninmodemsoci
Indeterminingthevalueofspecialprotectivelaborlegislationforwomen,whatdoestheauthorconsidermosthelpful?Ashort
Anawkward-lookingcharactersuchasCyranodeBergeracmightsniffatthesuggestion,butrecentscientificresearchshowsbeau
IntheUnitedStates,thefirstday-nurserywasopenedin1854.@Nurserieswereestablishedinvariousareasduringthe(1)_____
随机试题
A、K+外流B、Ca2+内流和K+外流C、Na+内流D、Ca2+缓慢内流E、Na+和Ca2+内流心室肌细胞2期平台期主要是由于
查科(Charcot)三联征对哪种疾病有诊断意义
对某地25~55岁妇女进行的一项调查发现:服用口服避孕药者中,心肌梗死的年发病率为5/10万,而不服用者为2/10万。据此,研究者认为:服用口服避孕药是引起心肌梗死的危险因子。这个结论是
A.食物中缺少碘B.甲状腺激素合成减少C.食物中缺少酪氨酸D.血中甲状腺激素浓度过高E.促甲状腺激素合成减少甲状腺危象的发病原因是
为保证施工现场用电安全,有效防止触电和电器火灾事故,施工现场临时用电工程专用的电源中性点直接接地的220V/380V三相四线制低压电力系统。下列不属于三项基本用电原则的是()。
姜晶今年17岁,在两年前被学校劝退,现在独自在家自学。她为自己制订了很详细的学习计划,每天很有规律地阅读自己喜欢的书籍,写一些文章在网络上发表,或是学一些感兴趣的知识。这样好学的孩子为什么会被学校劝退呢?经过社会工作者去学校所作的了解,姜晶是因为违反学校的
以下属于我国法律对象效力确定原则的是()。
Whyiscornfeedingmillionsofpeopletoday?
HowmanyrefugeescamefromVietnamsincetheearly1970s?
TheMagicofMemory—ByLaurenceCherryOurmemoriesare
最新回复
(
0
)