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
2024-04-03
32
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 31 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 because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are 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] Why is the fuel consumption greater in the northern hemisphere, but temperatures there seem to be falling?
选项
A、Mainly because the levels of carbon dioxide are rising.
B、Possibly because the ice caps in the poles are melting.
C、Because the inertia of the earth’s climate take effect.
D、Partly because in the output of solar energy varies.
答案
D
解析
从第5段最后一句给出的设问可知,第6段的首句是考点之所在,即:“一种可能性(自然因素)是变化无常的太阳活动。”由此可以判断,D项的内容符合题意。A项说的是人为的因素,即温室效应。事实上,A项和D项是作为两个影响气候的对立因素出现的,同时也是本文论及的两个分话题,由此也可以直接判断D项为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3539675.html
相关试题推荐
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Amassivepoolofwarmoceanwateriscausingchangesintheatmospherethat
Amassivepoolofwarmoceanwateriscausingchangesintheatmospherethat
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Ratherthanusingcustommachinetoolstobuildearlymodelsofnewparts,F
Ratherthanusingcustommachinetoolstobuildearlymodelsofnewparts,F
Ratherthanusingcustommachinetoolstobuildearlymodelsofnewparts,F
随机试题
Tworelatedparadoxesalsoemergefromthesamebasicconceptionoftheaes
[originaltext]W:Stan,doyouhaveaminute?M:Oh,hi,Cathy.Sure.What’sup?
()电信网()因特网服务提供商[br]()下线()垃圾邮件N、H
TheworkforwhichThomasMalthusisstillmostwidelyknownishisEssayon
下列属于物流战略管理主要特征的有()。A.目的性 B.系统性 C.风险性
项目经理小李对某活动工期进行估算时,发现人员的熟练程度和设备供应是否及时对工期至
2002-151.哮证的病因是 A.宿痰内伏B.外邪侵袭C.饮食不当D
某大学教授认为,用西方思想来消解中国的传统文化成了“五四”新文化运动先驱们的有效
下列关于商用房地产和居住房地产押品分类的是()。A.房地产类在建工程 B.商
某企业为增值税一般纳税人,在建工程领用自产柴油成本50000元,应纳消费税
最新回复
(
0
)