首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
In the atmosphere, carbon dioxide acts rather like a one-mirror-the glass in the roof of a greenhouse which allows the sun’s ray
In the atmosphere, carbon dioxide acts rather like a one-mirror-the glass in the roof of a greenhouse which allows the sun’s ray
admin
2012-01-19
33
问题
In the atmosphere, carbon dioxide acts rather like a one-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 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 Antarcitic ice are already disappearing. The evidence available suggests that a warming takes 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 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 the most effect on the weather?
On 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 rotated, every 27.5 days, it presents hotter of "colder" face 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 new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a way of thousands of years while the solar effects overcome the inertia (惯性的) of the earth’s climate. If this is right, the warming effect of carbon dioxide might thus be serving a useful counter-balance to the sun’s diminishing heat.
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、account for great changes in the climate in the northern hemisphere
D、raise the temperature of the earth’s surface
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/Tkxd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Usuallypeoplecan’tfeelthechangeofthesociety.Fromgenerationtogenerationweliveinthesameframeoffamilyandstruc
MeganDellaSelva,whohasalreadytradede-mailmessageswithhermom,justtosayhi,isa______.
MeganDellaSelva,whohasalreadytradede-mailmessageswithhermom,justtosayhi,isa______.
Twofactorsweighheavilyagainsttheeffectivenessofscientificresearchinindustry.Oneisthegeneralatmosphereofsecrecy
Twofactorsweighheavilyagainsttheeffectivenessofscientificresearchinindustry.Oneisthegeneralatmosphereofsecrecy
Wherehavethefamilydecidedtogoforthevacationthissummer?
Weoftenfeelblindlyproudofourgreatachievementsineconomy,andevenofourculture.Asamatteroffact,ourculturehas
Itdoesn’ttakeanEinsteintorecognizethatAlbertEinstein’sbrainwasverydifferentfromyoursandmineThegraymatterhou
Itdoesn’ttakeanEinsteintorecognizethatAlbertEinstein’sbrainwasverydifferentfromyoursandmineThegraymatterhou
随机试题
中国人民银行是我国的中央银行。()
EveryoneknowshowtogettoCarnegieHall:practice,practice,practice.Butwhatabouthowtogetintothenation’smosthonor
企业为弄清行业内各企业总的生产能力与社会需要之间的关系而进行分析,这属于
简述宋朝为了适应君主专制集权的需要对监察制度进行改革的主要内容。
诊断再生障碍性贫血最重要的指标是
女,22岁,圆7严重龋坏,需拔除。如果牙根折断,使用“丁”字挺时应用的力学原理是
DIC时微血管内的血栓称之为
一个热力站有五个阀门控制对外送蒸汽。使用这些阀门必须遵守以下操作规则:(1)如果开启1号阀,那么必须同时打开2号阀并且关闭5号阀。(2)如果开启2号阀或者5号阀,则要关闭4号阀。(3)不能同时关闭3号阀和4号阀。现在
恩格斯说:“人的智力是按照人如何学会改变自然界而发展的。”这表明人的才智
______hadtheplanelandedthanpeoplerantowardsit.
最新回复
(
0
)