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
2023-09-11
47
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/3004827.html
相关试题推荐
WhenIgotowork,______(我喜欢乘公汽而不是自己驾车).Iprefertakingthebusratherthandr
You’dbettervaryyourdiet__________(不要总吃同样的东西).ratherthaneatthesamethi
Sheissogenerous.______(我宁愿她把重活留给别人)I’drathershelefttheheavyendofth
He’dratherreadabookonphysics__________________________(甚于看电影或者在电视上看足球比赛).
Thesebravesoldierswould_________________(宁死不降).ratherdiethansurrender
Theauthorscriticise______(现行的奖励失败的体制)andfocusingoncost,ratherthanvalue
Intheatmosphere,carbondioxideactsratherlikeaone-waymirrortheglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirrortheglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirrortheglas
__________________(在乡间有一种祥和宁静的气氛),quitedifferentfromtheatmosphereofabig
随机试题
FilmisamediumthatmighthavebeenespeciallymadeforAmerica,avastco
Heworksincrediblyhardandyetneedsverylittlesleep—hemusthaveastrong__
[originaltext]M:Hello!ThisisJackSmithfromABCcompany.MayIspeaktoMr.
安管人员涂改、倒卖、出租、出借或者以其他形式非法转让安全生产考核合格证书的,由县
《建设工程安全生产管理条例》规定,发生生产安全事故后,施工单位应当采取措施防止事
将未患某病而有或无暴露因素的人群作为研究对象,其研究是()A.队列研究 B
下列关于城市工程管线综合布置原则的表述,哪些是错误的?()(2013年真题
某整体筏板大底盘建筑物,2栋高层塔楼之间为纯地下车库。基础埋深10m,地下车库顶
垃圾填埋场泥质防水层在拌合土摊铺碾压后应检验的项目是()A.压实度试验和渗水试
下列分析取源部件安装位置的要求,正确的是()。A.应安装在压力变化的位置 B
最新回复
(
0
)