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 atmosphere, carbon dioxide acts rather like a one way mirror—the glass in the roof of a greenhouse which allows the sun’s
In the atmosphere, carbon dioxide acts rather like a one way mirror—the glass in the roof of a greenhouse which allows the sun’s
admin
2010-07-14
39
问题
In the atmosphere, carbon dioxide acts rather like a one way mirror—the glass in the roof of a greenhouse which allows the sun’s rays to enter but prevents the heat from escaping.
According to a weather expert’s prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several meters and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere, possibly resulting in an alteration of the earth’s chief food-growing zones.
In the past, concern about a man-made warming of the earth has concentrated on the Arctic (北极) because the Antarctic (南极) is much colder and has much thicker ice sheets. But the weather experts arc now paying more attention to West Antarctic, which may be affected by only a few degrees of warming: in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.
Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.
However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. Scientists conclude, therefore, that up to now natural influences on the weather have exceeded those caused by man. The question is: Which natural cause has most effect on the weather?
One possibility is the variable behavior of the sun. Astronomers at one research station have studied the hot spots and "cold" spots (that is, the relatively less hot spots) on the sun. As the sun rotates, every 27.5 days, it presents hotter or "colder" faces to the earth, and different aspects to different parts of the earth. This seems to have a considerable effect on the distribution of the earth’s atmospheric pressure, and consequently on wind circulation. The sun is also variable over a long term: its heat output goes up and down in cycles, the latest trend being downward.
Scientists are now finding mutual relations between models of solar-weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering a new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia (惯性) of the earth’s climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful counter-balance to the sun’s diminishing heat.
It can be concluded that a concentration of carbon dioxide in the atmosphere would ______.
选项
A、prevent the sun’s rays from reaching the earth’s surface
B、mean a warming up in the climate in the Arctic hemisphere
C、account for great changes in the climate in the northern hemisphere
D、raise the temperature of the earth’s surface
答案
D
解析
细节题。根据第一段后半句,二氧化碳的作用是允许太阳光进入,同时防止热量逃逸,从而使地球表面升温。
转载请注明原文地址:https://jikaoti.com/ti/l0MMFFFM
0
大学英语六级
相关试题推荐
Theeconomiccostsofnoisetosocietyareseveral.Airportsarecurrentlyop-eratingatlessthancapacitybecauseofnoisere
Sleepwalkingisadisordercharacterizedbywalkingorotheractivitiesapersonengagedinwhile【S1】stillasleep.Itisespe
A、Callonpeopletoprotectsharks.B、Pointoutthelivingenvironmentofsharks.C、Explainwhythesharksaredangerous.D、Ani
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterprise,marketorientedeconomyinwhichconsumerslarg
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterprise,marketorientedeconomyinwhichconsumerslarg
Somepsychologistsmaintainthatmentalactssuchasthinkingarenotperformedinthebrainalong,butthatone’smusclesal
TheEnvironmentalProtectionAgencyhassetlimitsfortheradiationpermittedtoleakfromaproposednuclearwasteburialce
TheEnvironmentalProtectionAgencyhassetlimitsfortheradiationpermittedtoleakfromaproposednuclearwasteburialce
Technologyisatwo-edgedsword.Rarelyisthisasclearasitisintherealmofhealthcare.Technologyallowsdoctorstotest
A、Theylivedaluxuriouslifeandtheirdietwasverydelicate.B、Theylivedahighlycivilizedcourtlife.C、Theylivedaprimi
随机试题
与乳腺癌有关的激素受体为
关于早期釉质龋病变,不恰当的是
男性,28岁,突起寒战、高热、恶心、呕吐、腰痛已5d。体检:重病容,眼睑水肿,球结膜及胸部皮肤充血,腋下见少许点状出血点,血压70/50mmHg,怀疑流行性出血热。本例必须首先考虑的治疗措施是
划拨依法转为出让的国有建设用地使用权初始登记的申请人为原划拨国有建设用地使用权人。申请人应当提交的权属证明文件包括()。
在研究设备来源时,应按()的原则确定。
某建筑工程室内防水工程由专业分包人施工,由于其管理组织不力,施工严重滞后,导致整个工程进度延误,据此,发包人应向()提出工程索赔要求。
在()机床中,必须有间隙自动调节装置。
微分方程y’’+4y=cos2x的通解为y=__________.
某模拟网站的地址为HTTP://LOCALHOST/index.htm,打开此网站,找到此网站的首页,将首页上所有最强评审的姓名作为Word文档的内容,每个姓名之间用逗号分开,并将此Word文档保存到考生文件夹下,文件命名为“Allnames.docx”。
A、Noproblem.B、Goahead.C、Hereyouare.D、Takecare.A题干问的是“我能跟你们经理预约见面吗?”对于此类询问意见的回答,肯定回答常用Sure/Certainly/Noproblem等;否定回答常用S
最新回复
(
0
)