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
2012-10-23
49
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.
The level of carbon dioxide, CO
2
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 CO
2
easily. The Earth, however, reradiates much of the received energy as a long-wavelength radiation, Which CO
2
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 CO
2
, whose surface temperatures have been measured at 430℃. If the CO
2
content of the atmosphere is reduced, the temperature falls. According to one respectable theory, if the atmospheric CO
2
concentration were halved, the Earth would become completely covered with ice. Another equally respectable theory, however, states that a halving of the CO
2
concentration would lead only to a reduction in global temperatures of 3℃.
If, because of an increase in forest fires or volcanic activity, the CO
2
content of the atmosphere increased, a warmer climate would be produced. Plant growth, which relies on both the warmth and the availability of CO
2
, would probably increase. As a consequence, plants would use more and more CO
2
. Eventually CO
2
levels would diminish and the climate, in turn, would become cooler. With reduced temperatures many plants would die; CO
2
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 CO
2
present in the atmosphere, with regular temperature increase and decrease of a set magnitude.
Some climatologists argue that the burning of fossil fuels has raised the level of CO
2
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 increase, 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 decrease that is unrecognized because of the shortage of meteorological recording stations.
The passage suggests that a large decrease in the amount of CO
2
in the atmosphere would result in ______.
选项
A、at least a slight decrease in global temperatures
B、at the most a slight increase in short-wavelength radiation reaching the earth
C、a slight long-term increase in global temperatures
D、a slight short-term increase in global temperatures
答案
A
解析
本题的四个选项中,只有A项为正确答案。这可从文中第二段的最后几句话推知,即在这几句中作者介绍了两种理论:根据第一个理论,如果大气中的CO
2
减半,地球就会完全被冰所覆盖。根据第二个理论,如果大气中C02的含量减半,全球气温会下降三摄氏度。据此可知,这篇文章暗示大气中CO
2
含量锐减至少会导致全球气温小幅度下降。
转载请注明原文地址:https://kaotiyun.com/show/sF9O777K
0
考博英语
相关试题推荐
Thekidsarehangingout.Theyarenotoldenoughforjobs.Noraretheyrichenoughforcamp.Theyareschoolchildrenwithout
Shehadrecentlyleftajobandhadhelpedherselftocopiesofthecompany’sclientdata,whichsheintendedto______instartin
Beforetheconstructionoftheroad,itwasprohibitivelyexpensivetotransportanyfursorfruitsacrossthemountains.
Uponreachinganappropriateage(usuallybetween18and21years),childrenareencouraged,butnotforced,to"leavethenest"
Language,likefood,isabasichumanneedwithoutwhichachildatacriticalperiodoflifemightbe______anddamaged.
Inthissectionyouarerequiredtowriteanessayinaccordancewiththefollowingrequirements:1.Tide:OnBusinessmen’s
The______ofgiftedchildrenintoacceleratedclasseswillstartnextweekaccordingtotheiracademicperformance.
Inthispart,youarerequiredtowriteacompositionentitledMigrantFarmerWorkersinChinainnolessthan200words.Yourc
Manyagentsquitandsaytheyareleavingbecausetheyare______andwantbetterpayandmorehumaneworkingconditions,includin
Thelocalpeoplewerejoyfullysurprisedtofindthepricesofvegetablesnolonger______accordingtotheweather.
随机试题
自然地理环境是造成文化差异的最根本和最直接的因素。【 】
该患者最可能的诊断是( )。采取哪项护理措施比较适宜( )。
提出“治外必本诸内”思想的专著是
监理单位与建设单位、承建单位的关系都是()关系。
《重大危险源辨识》(GB18218—2000)适用的危险物质包括()。
在各种资本结构理论中,认为负债水平越高,企业价值越大的理论是()。
【2014年辽宁鞍山.单选】学校课外活动的组织形式不包括()。
深圳有一家公司专门替人找寻失物或亲人,收取一定的费用,有人说“做好事不能收费”,你怎么看?
评价拿破仑战争性质。
(46)Culture,inabroadsense,meansthetotalwayoflifeofapeople,includingthepatternsofbelief,customs,institutions,
最新回复
(
0
)