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
In the United States the science of climate change still remains a controversial issue. Part of the problem is that it is comple
In the United States the science of climate change still remains a controversial issue. Part of the problem is that it is comple
admin
2015-02-12
42
问题
In the United States the science of climate change still remains a controversial issue. Part of the problem 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 the earth, protecting it 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 "biosphere", 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 preserved in cores of sediment taken beneath the floor of the Indian Ocean. They provide a record 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.
The first paragraph of the text deals mainly with the earth atmosphere’s______.
选项
A、sheltering effect
B、reviving effect
C、invigorating effect
D、cleansing effect
答案
A
解析
属主旨思想题,考查第一段的内容概括。第一段主要介绍大气层是地球的保护者。
转载请注明原文地址:https://kaotiyun.com/show/ws74777K
0
考研英语一
相关试题推荐
SweepaFuelCraftInvestFeverTheclean-energybusinessisturningintothenextbiginvestmentboom,inwhichrisksarel
TheGradePointSystemofSchoolintheUnitedStatesNaperville’sschoolofficialsrecentlyvotedtostopusingaclassran
TheEducationSystemoftheUnitedStatesThecountriesthathavelefttheUnitedStatesbehindinmathandscienceeducatio
TheEducationSystemoftheUnitedStatesThecountriesthathavelefttheUnitedStatesbehindinmathandscienceeducatio
TheChangesofAmericanCollegeStudentsEnrollmentSystemInanidealworld,thenation’seliteschoolswouldenrollthemo
TheFeverofPhilosophyDiscussionThere’sabuzzintheairattheElDiabloCoffeeCo,inSeattle,andit’s,notjustcomi
Throughoutthe19thcenturyandintothe20th,citizensoftheUnitedStatesmaintainedabiasagainstbigcities.Mostlivedon
Throughoutthe19thcenturyandintothe20th,citizensoftheUnitedStatesmaintainedabiasagainstbigcities.Mostlivedon
随机试题
交警对违反交通规则骑车的王某,当场作出罚款30元的处罚决定。下列说法错误的是()
A.癫痫、偏身感觉障碍、失用、失算B.精神症状、运动性失语、偏瘫C.感觉性失语、同向上1/4象限盲D.步态异常、共济失调、眼震、构音障碍E.视力减退、双颞侧偏盲、闭经、尿崩
某患者,男,20岁,从5米高处落下,头额部先着地,伤后昏迷送医院后才逐渐清醒,3小时后患者再次昏迷。检查:脉搏60次/min,血压21.28/11.97kPa,呼吸12次/min,诊断应是
A.附子B.肉桂C.干姜D.吴茱萸E.小茴香
房地产业与金融业息息相关。下列有关方面的阐述不当的选项为()。
事业单位的收入应采用收付实现制核算,不得采用权责发生制核算。()
下列能源中不属于一次能源的是:
Thecompany_______toloseoneofitsoldestaccountssinceitfailedtomeetthecustomer’sneedsseveraltimes.
TherearemanytheoriesaboutthebeginningofdramainancientGreece.Theonemostwidelyacceptedtodayisbasedontheassum
BuyingaUsedCarThereareseveralwaystobuyusedcars./Placesthatsellnewcarsusuallyhaveusedcarsforsaleaswe
最新回复
(
0
)