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
In the United States the science of climate change still remains a controversial issue. Part of the problems is that it is compl
In the United States the science of climate change still remains a controversial issue. Part of the problems is that it is compl
admin
2010-09-10
55
问题
In the United States the science of climate change still remains a controversial issue. Part of the problems is that it is complex and hard to isolate its parts. We do know how vital it is to life. The atmosphere forms a gaseous, protective envelope around earth protecting the earth from the cold of space, from harmful ultraviolet light, and from all but the largest meteors. After traveling over 93 million miles, solar energy strikes the atmosphere and earth’s surface, warming the planet and creating what is known as the "bio sphere" which is the region of earth capable of sustaining life. Atmospheric circulation is one important reason that life on earth can exist at higher latitudes because equatorial heat is transported poleward, moderating the climate.
The atmosphere is not just a protector but also a great transporter. The transport of water vapor in the atmosphere is an important mechanism by which heat energy is redistributed poleward. Heat energy absorbed at the equator is deposited at the poles and the temperature gradient between these regions is reduced. The circulation of the atmosphere and the weather it generates is but one example of the many complex, interdependent events of nature. The web of life depends on the proper functioning of these natural mechanisms for its continued existence.
Some argue that climate change is too complicated to be attributed only to human activity. For example, fossil studies of radiolaria, a group of one-celled animals characterized by silicon-containing shells, have given scientists a fairly accurate account of climatic conditions in the distant past. Geologists found these 450,000-year-old microorganisms pre served in cores of sediment taken beneath the floor of the Indian Ocean. They provide a re cord of cycles of climatic changes, determined by the alternating layers of species of warm and cold-preferring radiolaria. We now have confirmation that changes in the earth’s orbital geometry caused the ice ages.
This does not let us off the hook because although we can hardly alter the basic forces at work that alter climate, even small contributions by humans can have dramatic effects. Given nature’s interconnectedness, it is possible that the most serious threats have yet to be recognized.
It can be concluded from the passage that.
选项
A、the circulation of atmosphere protects the biosphere and makes life on earth possible.
B、if the protective atmosphere is too damaged by human activity, all life will cease.
C、life is the result of complex interdependent events of nature
D、despite the complexity and power of the atmosphere humans can affect it greatly
答案
D
解析
属主旨思想题。本文的结论是:人类的些许作用对气候变化会产生重大影响。
转载请注明原文地址:https://kaotiyun.com/show/ZI87777K
0
大学英语四级
相关试题推荐
ThiswasthememorialserviceforoldThomasBevill,whohaddiedbeforeChristmasattheageofeighty-eight.WhenbewasaMin
Energylevelsebbandflowthroughouttheday,influencedbyeverythingfromyourmoodtoyourbody’scircadianrhythms(生理节奏)—d
A、Totellthetruth.B、Totellallthedetails.C、Tobereadytoansweranyquestionsincourt.D、Toidentifythepersonssheis
ImpressionsofAmericaSanFranciscoisareallybeautifulcity.ChinaTown,peopledbyChineselabourers,isthemostartis
A、Takinganexam.B、Havingaclassdiscussion.C、Givingpresentation.D、Drawinggraphs.C
Canmoneybuyhappiness?Yes,exclaimtheauthorsofanew【M1】______study—butonlyuptoapoint.Psychologyhas
Lowlevelsofliteracy(读写能力)andnumeracy(计算能力)haveadamagingimpactonalmosteveryaspectofadultlife.Testsandintervi
A、Before9o’clock.B、At10o’clock.C、Atabout9:15.D、After9:50.C
A、Hewasannoyed.B、Hewashappy.C、Hewasinterestedintheinsurance.D、Hedidn’tshowanyreaction.A从题目选项答案可以得知,该题考查he的态度。从“
Nowtheincomegapisgettingwiderandwider.Insomeprivatelyownedfirms,【B1】______,orforeign-fundedcompanies,an【B2】___
随机试题
A.肠痈B.积C.聚D.虫积胸脘腹硬满疼痛且拒按者,属于
悬空桥桥体龈面与牙槽嵴黏膜之间的间隙为
下列说法正确的是()。
有三项投资,资料如下表,要比较哪项投资有利,可以使用的方法是( )。
运往境外修理货物,应当以该出境货物在境外修理时支付的修理费和料件费加上该货物复运进境的运输及其相关费用、保险费审查确定完税价格。()
城建税按纳税人所在地的不同,设置了三档地区差别比例税率,纳税人在市区的,税率为()。
考试将至,小李认真复习,发誓要考出一个好成绩,这时他的动机属于长远的间接动机。
某部门买来一批劳保用品,平均分配,每人可分6份;如果只分给男同志,每人可分10份。请问,如果只分给女同志,每人可分得多少份?
Google’sPlanforWorld’sBiggestOnlineLibrary:PhilanthropyOrActofPiracy?Inrecentyears,teamsofworkersdispatche
IftwoscientistsatLosAlamosNationalLaboratoryarecorrect,peoplewillstillbedrivinggasoline-poweredcars50yearsfro
最新回复
(
0
)