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
Humans have altered the world’s climate by (1)_____ heat-trapping gases since almost the beginning of civilization and even prev
Humans have altered the world’s climate by (1)_____ heat-trapping gases since almost the beginning of civilization and even prev
admin
2009-04-27
75
问题
Humans have altered the world’s climate by (1)_____ heat-trapping gases since almost the beginning of civilization and even prevented the start of an ice age several thousand years ago, a scientist said.
Most scientists (2)_____ a rise (3)_____ global temperatures over the past century (4)_____ to emissions of carbon dioxide (5)_____ human activities like driving cars and operating factories.
Dr. William Ruddiman, a professor at the University of Virginia, said at a meeting of the American Geophysical Union (6)_____ humans’ effect (7)_____ climate went back nearly 10, 000 years (8)_____ people gave up hunting and gathering and began farming.
In a commentary accompanying the article, Dr. Thomas J. Crowley of Duke University, said he (9)_____ Dr. Ruddiman’s premise at first. "But when I started reading, Dr. Crowley wrote, "I could not help but (10)_____ whether he just might be (11)_____ something."
The climate of the last 10,000 years has been unusually stable, (12)_____ civilization to flourish. But that is only because people chopped down swaths of forest in Europe, China and India for croplands and pastures. Carbon dioxide (13)_____ by the destruction of the forests, plus methane, another heat-trapping gas, (14)_____ by irrigated rice fields in Southeast Asia, trapped enough heat to (15)_____ an expected natural cooling.
Levels of carbon dioxide and methane rise and fall in natural cycles (16)_____ thousands of years, and both reached a peak at the end of the last ice age 11;000 years ago. Both then declined (17)_____ expected.
Both (18)_____ declining through the present day, leading to lower temperatures, and a new ice age should have begun 4,000 to 5,000 years ago, Dr. Ruddiman said. Instead, levels of carbon dioxide reversed 8,000 wears ago. The decline (19)_____ methane levels reversed 5,000 years ago, (20)_____ with the advent of irrigation rice farming.
选项
A、have been
B、would have been
C、could have been
D、should have
答案
D
解析
使用语法。如果在现代,两者继续下降引起气温下降,那么一个新的冰川期就应该在四、五千年之前开始了。下文里有instead表明一切都没有发生,只是假设。过去应该发生而没有发生的事应该用should have...。
转载请注明原文地址:https://kaotiyun.com/show/18a4777K
0
考研英语一
相关试题推荐
Ireallydisliketheterm"Aplayer."Itimpliesagradingsystemthatcandeterminewhowillbebestforaposition.HRpeople
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubheadingfromthelistA-Gforeachnumberedpa
[A]Identifypeoplewhoyouwanttotalkto[B]Findoutwhereyoursupportis[C]Askfortheflooratconferences[D]
[A]Waysforparentstohelpdeafchildrenspeak[B]Variousreactionsofparentstotheirdeafchildren[C]Badattitude
GivenalltheroilingdebatesabouthowAmerica’schildrenshouldbetaught,itmaycomeasasurprisetolearnthatstudentssp
Anothergraduationceremonyhascomeandgone,andChaunceyWoodardisstillastudentattheUniversityofAlabama.Hecameto
Onthesurface,Marsisthepictureofdesolation.Abarrenlandremains【C1】______forhundredsofmillionsofyears,motionless【
Thedeclineofcivilityandgoodmannersmaybeworryingpeoplemorethancrime,accordingtoGentilityRecalled,editedbyDigb
TheSevenWondersoftheAncientWorldwereacollectionofremarkableconstructionslistedbyvariousGreekauthors,including
Italmostdidn’thappen.TherewasatimewhenMuirWoodscameclosetofeelingthebiteofloggers’saws.Butstrongeffortsby
随机试题
“电波三法”
下列微分方程中,为一阶线性方程的是()
关于肾脏解剖结构的描述,错误的是
质权和抵押权都属于担保物权的范畴,但二者是不同的担保物权,质权的法律特征主要包括()。
稳健型投资者为了获得稳定的现金流,应当投资于()基金。
企业领导体制的监控系统的根本任务有()。
难以对某项变更区分为会计政策变更或会计估计变更的,应当将其作为()处理。
刘大年在《当前近代史研究的几个理论问题》一文中指出:“中国近代110年的历史基本问题是两个。一是民族不独立,要求在外国侵略压迫下解放出来;二是社会生产落后,要求工业化、近代化。两个问题内容不一样,又与之相关,不能分离。” 综合所学知识,请从背景、过程、
某重点高校20岁的大二学生王晓,起诉要求父亲王军支付大学期间的教育费和生活费,但王军因收入有限拒绝支付。对此,下列观点正确的是()。
Mostpeoplebelievethatthegovernmentaldepartmentsshouldgive______serviceatminimumcost.
最新回复
(
0
)