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
27
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
Earth:MeltingintheHeat?Glaciersareme
在某国,每年有比例为p的农村居民移居城镇,有比例为q的城镇居民移居农村,假设该国
()是信息的单向被动传递。A.会议通知 B.信息咨询服务 C.图书借阅服务
规划阶段对于峡谷地区坝址两岸勘察宜布置()。A.物探剖面 B.勘探平硐
Canyoudothetaskalone,ordoyouwant
一个测验题目“尽可能多的列出曲别针的用途”,通常用于测量( )A.聚合思维
急性病毒性心肌炎最有效的治疗措施是A.应用激素泼尼松 B.用抗病毒药物治疗
莎士比亚,文艺复兴时期伟大的剧作家和诗人,其主要作品有( )。A.《哈姆雷特》
①单纯罗列史料,构不成历史 ②只有在史料引导下发挥想象力,才能把历史人物和事
钢筋经过冷拉及时效处理后可具有的优点是()。A.提高了钢筋的塑性和韧性
最新回复
(
0
)