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
There are hidden factors which scientists call "feedback mechanisms". No one knows quite how they will interact with the changin
There are hidden factors which scientists call "feedback mechanisms". No one knows quite how they will interact with the changin
admin
2012-06-18
26
问题
There are hidden factors which scientists call "feedback mechanisms". No one knows quite how they will interact with the changing climate. Here’s one example:plants and animals adapt to climate change over centuries. At the current estimate of half a degree centigrade of warming per decade,vegetation may not keep up. Climatologist James Hansen predicts climate zones will shift toward the poles by 50 to 75 kilometers a year—faster than trees can naturally migrate. Species that find themselves in an unfamiliar environment will die. The 1,000-kilometer-wide strip of forest running through Canada, Russia,and Scandinavia could be cut by half. Millions of dying tress would soon lead to massive forest fires,releasing tons of CO
2
and further boosting global warming.
There are dozens of other possible "feedback mechanisms". Higher temperatures will fuel condensation and increase cloudiness, which may actually damp down global warming. Others,like the"albedo"ef-fect is the amount of solar energy reflected by the earth’s surface. As northern ice and snow melts and the darker sea and land pokes through,more heat will be absorbed,adding to the global temperature increase. Even if we were to magically stop all greenhouse-gas emissions tomorrow,the impact on global climate would continue for decades. Delay will simply make the problem worse. The fact is that some of us are doing quite well the way things are. In the developed world prosperity has been built on 150 years of cheap fossil fuels.
Material progress has been linked to energy consumption. Today 75 percent of all the world’s energy is consumed by a quarter of the world’s population. The average rich-world resident adds about 3.2 tons of CO
2
yearly to the atmosphere,more than four times the level added by each Third World citizen. The US,with just seven percent of the global population,is responsible for 22 percent of global warming.
Which of the following is the main topic of the passage?
选项
A、Impact of global warming on climate.
B、Prosperity and cheap fossil fuels.
C、Material progress and energy consumption.
D、Plants and animals in the changing climate.
答案
A
解析
主旨题。文章指出“No one knows quite how they will interact with the changing climate.Millionsof dying tress would soon lead to massive forest fires,further boosting global warming.There aredozens of other possible“feedback mechanisms”.which may actually damp down global warming.Even if we were to magically stop all greenhouse—gas emissions tomorrow the impact on global climatewould continue for decades.”这说明,本文主要讲的是“全球变暖对气候的影响”。这与A符合。B、C和D只是文章部分段落的内容,不能表达文章的中心意思。
转载请注明原文地址:https://jikaoti.com/ti/x9bYFFFM
0
考博英语
相关试题推荐
______,hedidbecomeannoyedwithherattimes.
Thedegreeofdownwardslopeofabeachdependsonitscompositionofdepositsaswellasontheactionofwavesacrossitssurf
Inthispart,youarerequiredtowriteacompositionentitledOnMistakesinnolessthan200words.Yourcompositionshouldbe
Intheirworldofdarkness,itwouldseemlikelythatsomeoftheanimalsmighthavebecomeblind,ashashappenedtosomecave
Althoughoftenextremelycriticalofthemedicalprofessionasawhole,peoplearerarelywillingtotreattheirpersonaldoctor
IntheUnitedStatesandinmany【51】countriesaroundtheworld,therearefourmainwaysforpeopletobeinformed【52】develo
Theteacher______fromhercustomandgaveusnohomeworkyesterday.
Thedoctorponderedforawhile,tryingtorecallwhichofseveralmedicationswouldbebestto______thepatient’ssuffering.
Hisvoice______hisWelshoriginsthoughhehasbeenlivinginNewYorkfor25years.
Mr.Whitebroughtacounterchargeagainstyoubecauseyouhad______himforsmugglingseveralpiecesofantiquesandculturalre
随机试题
可燃气体或蒸气与空气的混合物,若其浓度在爆炸下限以下或爆炸上限以上时便不会着火或爆炸。()
围婚保健包括
对手术室医护人员的手、物品进行定期细菌培养的周期是
企业总体战略是关系企业经营发展全局的战略,大致有()。
甲公司2011年12月31日应收账款余额为200万元,“坏账准备”科目贷方余额为5万元;2012年发生坏账8万元,已核销的坏账又收回2万元。2012年12月31日应收账款余额为120万元(其中未到期应收账款为40万元,估计损失2%:过期1个月应收账款为3
美国社会学家研究犯罪问题时发现,在犯罪率较高的社区内,一些男孩子自幼就模仿犯罪团伙中大男孩子的行为,认为他们勇敢、大胆,是真正的男子汉,视他们为楷模,直至最后堕落成犯罪团伙成员。这类犯罪团伙在该社区内成了许多小男孩子心目中的()。
义务教育的本质特征是()。
关于导体及其导电原理,下列说法错误的是()。
刚刚过去的春节长假,文化消费市场可谓精彩纷呈。从北方逛庙会、看冰灯,到南方逛花市、水乡游;从城市电影票房、演出市场屡创新高,到乡村文化大集、农民春晚渐成风尚,无一不是人们对文化消费旺盛需求的生动写照和最好诠释。对于今天富裕起来的中国人来说,春节已经不仅仅是
A、Walkingaroundtheaudience.B、Smilingwhileexplainingthenotions.C、Tellingsomejokesduringthespeech.D、Sharingsomepe
最新回复
(
0
)