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
Climatic conditions are delicately adjusted to the composition of the Earth’s atmosphere. If there were a change in the atmosphe
Climatic conditions are delicately adjusted to the composition of the Earth’s atmosphere. If there were a change in the atmosphe
admin
2013-11-29
21
问题
Climatic conditions are delicately adjusted to the composition of the Earth’s atmosphere. If there were a change in the atmosphere for example, in the relative proportions of atmosphere gases the climate would probably change also. A slight increase in water vapor, for instance, would increase the hem-retaining capacity of the atmosphere and would lead to a rise in global temperatures. In contrast, a large increase, in water vapor would increase the thickness and extent of the cloud layer, reducing the mount of solar energy reaching the Earth’ surface.
level of carbon dioxide, CO2, in the atmosphere has important effect on climatic change. Most of the Earth’ s incoming energy is short-wavelength radiation, which tends to pass through atmospheric CO2 easily. The Earth, however, reradiates much of the received energy as a long-wavelength radiation, which CO2 absorbs and then remits toward the Earth. This phenomenon, known as the greenhouse effect, can result in an increase in the surface temperature of a planet. An extreme example of the effect is shown by the Venus, a planet covered by heavy clouds composed mostly of CO2, whose surface temperatures have been measured at 430℃. If the CO2 content of the atmosphere is reduced, the temperature falls. According to one respectable theory, if the atmospheric CO2 concentration were halved, the Earth would become completely covered with ice. Another equally respectable theory, however, states that a halving of the C02 concentration would lead only to a reduction in global temperatures of 3℃.
If, because of au increase in forest fires or volcanic activity, the CO2 content of the atmosphere increased, a warmer climate would be produced. Plant growth, which relies on both the warmth and the availability of CO2, would probably increase. As a consequence, plants would use more and more CO2. Eventually CO2 levels would diminish and the climate, in turn, would become cooler. With reduced temperatures many plants would die; CO2 would thereby be returned to the atmosphere and gradually the temperatures would rise again. Thus, if this process occurred, there might be a long-term oscillation in the amount of CO2 present in the atmosphere, with regular temperature increases and decreases of a set magnitude.
Some climatologists argue that the burning of fossil fuels has raised the level of CO2 in the atmosphere and has caused a global temperature rise of at least 1℃. But a supposed global temperature rise of 1℃ may in reality be only several regional temperature increases, restricted to areas where there are many meteorological stations and caused simply by shifts in the pattern of atmospheric circulation. Other areas, for example the Southern Hemisphere oceanic zone, may be experiencing an equivalent temperature decreases that is unrecognized because of the shortage of meteorological recording stations.
The author is primarily concentrated on ______.
选项
A、explaining the effects that the burning of fossil fuels might have on climate
B、illustrating the effects of CO2 on atmospheric radiation
C、discussing effects that changes in the CO2 level in the atmosphere might have on climate.
D、challenging hypotheses about the effects of water vapor and CO2 on climate
答案
C
解析
作者主要讨论大气中CO2含量对气候造成的影响。作者在第二段和第三段专门讨论这一问题。A不能选,因为作者只是轻描淡写地讨论这一问题。
转载请注明原文地址:https://kaotiyun.com/show/jQhO777K
0
考博英语
相关试题推荐
Scholarsmaintainthatsocialdevelopmentcaneasily____languagechanges.
Thegovernmentistobanpaymentstowitnessesbynewspapersseekingtobuyuppeopleinvolvedinprominentcases【21】thetrialo
Thegovernmentistobanpaymentstowitnessesbynewspapersseekingtobuyuppeopleinvolvedinprominentcases【21】thetrialo
Thegovernmentistobanpaymentstowitnessesbynewspapersseekingtobuyuppeopleinvolvedinprominentcases【21】thetrialo
Thegovernmentistobanpaymentstowitnessesbynewspapersseekingtobuyuppeopleinvolvedinprominentcases【21】thetrialo
Thegovernmentistobanpaymentstowitnessesbynewspapersseekingtobuyuppeopleinvolvedinprominentcases【21】thetrialo
AmericaLosesaGreatPublicThinkerArthurMiller’sdeathlastweekmeantmorethanthelossofanoutstandingplaywright.
Onemorning,afewyearsago,HarvardPresidentNeilRudenstineoverslept.Afteryearsofnon-stoptoilinanatmospherethatre
AmericaLosesaGreatPublicThinkerArthurMiller’sdeathlastweekmeantmorethanthelossofanoutstandingplaywright.
D.H.LawrencewasthefourthchildofArthurLawrenceandLydiaBeardsall,andtheirfirsttohavebeenborninEastwood.Ever
随机试题
食少纳差,大便溏,难以入睡,属于()型失眠。
坚定马克思主义的信仰,需要()
抵押物与质押物价值变动趋势一般可从()方面分析。
以企业的设备和其他动产抵押的,办理抵押物登记的部门为财产所在地的()。
安装在单位集体宿舍内,供职工和家属共同使用的电话按()用户处理。
给定资料(一)2013年11月中国共产党召开的第十八届三中全会,是全面深化改革的一次总动员和总部署。全会审议通过的《中共中央关于全面深化改革若干重大问题的决定》(以下简称《决定》),围绕“完善和发展中国特色社会主义制度,推进国家治理体系和治理能力
Whenshopkeeperswanttolurecustomersintobuyingaparticularproduct,theytypicallyofferitatadiscount.Accordingtoa
关系模型是把实体之间的联系用______表示。
Whenmyfatherwasgettingreadyforwork,our【C1】______wasruledbyknocksandwords.One【C2】______onthetablemeant"Iamrea
Kathywasauniversitystudent.Likemoststudentsshehadverylittlemoney,butshewantedtobuyacar."IfIcanbuyon
最新回复
(
0
)