首页
登录
职称英语
In the atmosphere, carbon dioxide acts rather like a one way mirror—the glas
In the atmosphere, carbon dioxide acts rather like a one way mirror—the glas
游客
2024-06-05
13
管理
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. [br] Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling. This is ______.
选项
A、mainly because the levels of carbon dioxide are rising
B、possibly because the ice caps in the poles are melting
C、exclusively due to the effect of the inertia of the earth’s climate
D、partly due to variations in the output of solar energy
答案
D
解析
细节题。根据第五段最后两句和第六段第一句和最后一句,太阳自身的多变行为可能是影响气候的自然因素。
转载请注明原文地址:https://tihaiku.com/zcyy/3621093.html
相关试题推荐
Thesebravesoldierswould_________________(宁死不降).ratherdiethansurrender
Theauthorscriticise______(现行的奖励失败的体制)andfocusingoncost,ratherthanvalue
I’dratherhavearoomofmyown,howeversmallitis,______________________(也不
Intheatmosphere,carbondioxideactsratherlikeaone-waymirrortheglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirrortheglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirrortheglas
ManyChineseemployees,evenqualifiedgraduates,thinkrigidlyratherthancrea
__________________(在乡间有一种祥和宁静的气氛),quitedifferentfromtheatmosphereofabig
Inanordinarymirroryourrighteyestaresatyourrighteyeandyourleft
ScientistssaythewarmingoftheEarth’satmospherehasbeguntoaffectpla
随机试题
Oneofthetypesofmetaphorusuallyreferringtowithlittle【S1】______admi
WhydidtheCalifornianfoodprocessorrecalltheirproducts?[originaltext]
下列关于数字出版产品的说法,错误的是()。A.同一种出版物可以采用多种载体进行
坚持和完善繁荣发展( ),巩固全体人民团结奋斗的共同思想基础。发展社会主义先进
共用题干 (一)资料2011年3月,某企业集团派出审计组对下属丙公司2010年
根据《招投标法实施条例》,关于依法必须招标项目中标候选人的公示,下列说法中正确的
原发性高血压高度危险组标准包括( )。A.高血压3级不伴危险因素 B.高血压
影响切道斜度的大小的因素是A.覆盖与覆的程度 B.上前牙向唇侧的倾斜度 C.
(2020年真题)下列各项中,应通过“其他应付款”科目核算的是( )A.应付存
男性,42岁,阵发性左腰部疼痛,剧烈难忍,伴恶心、呕吐,疼痛向同侧睾丸和大腿内侧
最新回复
(
0
)