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
6
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] 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 Arctic
C、cause great climate changes in the northern hemisphere
D、raise the temperature of the earth’s surface
答案
D
解析
从第1段对二氧化碳造成温室效应的原理描述,即可判断本题答案为D项。根据第4段第3句“这种情况符合二氧化碳使地球变暖的理论”也可判断D项符合题意。此外,本题也可以根据有关温室效应的常识求解。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3539673.html
相关试题推荐
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Amassivepoolofwarmoceanwateriscausingchangesintheatmospherethat
Amassivepoolofwarmoceanwateriscausingchangesintheatmospherethat
Amassivepoolofwarmoceanwateriscausingchangesintheatmospherethat
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Ratherthanusingcustommachinetoolstobuildearlymodelsofnewparts,F
Ratherthanusingcustommachinetoolstobuildearlymodelsofnewparts,F
随机试题
何谓幸福?每个人自有不同的衡量标准,虽然幸福的结局是那样的皆大欢喜。幸福可以漾在脸上,幸福也可以写在心里,当幸福在阳光下熠熠生辉时,幸福是灼人的。为什么
[A]benefits[B]different[C]eventually[D]instruments[E]moving[F]mul
某建筑企业2017年8月末资产负债简表如下:(单位:万元) 已知该企业7月
下列药物除哪项外均有止呕作用A.半夏 B.藿香 C.佩兰 D.白豆蔻 E
《中华人民共和国义务教育法》的内容包括( )。A.自2008年9月1日起施行
冬虫夏草适用于()干燥养护技术。A.摊晾法B.高温烘燥法C.石灰干燥法D.木炭
胰腺癌最常见的首发症状是A.黄疸 B.食欲下降 C.乏力消瘦 D.消化不良
关于哮喘的吸入疗法不正确的是A.吸入给药可以增加局部药物浓度 B.吸入疗法增加
根据《全国农业现代化规划(2016--2020年)》,关于现代农业重点功能区的划
治疗肾癌的主要方法是A.单纯肾切除 B.根治性肾切除 C.肾部分切除 D.
最新回复
(
0
)