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-way mirror—the glass in the roof of a greenhouse which allows the sun’s
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
admin
2018-08-25
28
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.
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://kaotiyun.com/show/qBH7777K
0
大学英语六级
相关试题推荐
A、InSeptember.B、InOctober.C、InNovember.D、InDecember.D本题问的是SocialNumber成立的时间。短文中明确提到了SocialNumber成立于12月份。
A、Theyprovidedmessagesfromthegods.B、Theywouldhelpmilitaryleadersinbattle.C、Theywereadifferentworldwevisitedw
A、Sellingdirecttothepublic.B、Sellingthroughtheirownchain.C、Sellingbyonlinestores.D、Sellingthroughsmallshops.C本
A、Toincreaseshoeseriesandoutput.B、Toconsolidatedifferentstylesoncampus.C、Toreceivemoresupportfromthesociety.D
A、Waitstilluntiltheenginehasbeenchanged.B、Getofftheairplaneandboardanotherone.C、Getofftheairplaneandgetthe
EdgarPoe,anAmericanwriter,wasbornin1809.Hisparentswereactors.Edgarwasababywhenhisfatherleftthefamily.Hew
A、Theyplantedmanytreesonmountains.B、Theyloweredtheircarbonemissions.C、Theysetasidemanyprivatelandsandwaters.D
WhyDepressionNeedsaNewDefinition[A]Manypsychiatristsbelievethatanewapproachtodiagnosingandtreatingdepression—li
RainforestCity[A]Apatchoftropicalrainforesthastwicethenumberofmammalspecies,fivetimesthebatsandbirdsandten
RainforestCity[A]Apatchoftropicalrainforesthastwicethenumberofmammalspecies,fivetimesthebatsandbirdsandten
随机试题
凝固性坏死总体形态特点是
中国梦的核心内容是国家富强、民族振兴、人民幸福,三者之间的关系是()
直条图可用于
白化病是由于人体内缺乏
某企业采购一台国产非标准设备,制造厂生产该台设备所用材料费22万元,加工费2万元,辅助材料费5000元,专用工具费4000元,废品损失费10%,外购配套件费6万元,包装费1000元,利润率为7%,税金4万元,非标准设备设计费3万元,运杂费率5%,该设备购置
根据企业破产法律制度的规定,人民法院受理破产申请后,破产申请受理前成立而债务人和对方当事人均未履行完毕的合同,下列对此表述错误的是()。
学习动机是由()几个方面构成。
根据下面材料回答下列问题。某市2010年全年实现农业增加值124.3亿元,比上年下降1.6%。粮食播种面积22.3万公顷,比上年减少0.3万公顷;粮食产量115.7万吨,比上年下降7.3%。全市农业观光园1303个,比上年增加9个;观光园总收入17.
Genetherapyandgene-baseddrugsaretwowayswecouldbenefitfromourgrowingmasteryofgeneticscience.Buttherewillbeo
TheCollector’sEditioncoinis______,andrepresentsatruecollector’streasuretobeappreciatedforgenerationstocome.
最新回复
(
0
)