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
2019-06-23
91
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.
If the assumption about the delay of a new Ice Age is correct, _____.
选项
A、the best way to overcome the cooling effect would be to burn more fuels
B、ice would soon cover the northern hemisphere
C、the increased levels of carbon dioxide could warm up the earth quickly
D、the greenhouse effect could work to the advantage of the earth
答案
D
解析
文章最后一句中的a useful counter-balance是指有益的抵消作用,即二氧化碳产生的热效应可以抵消太阳热量减少使地球变冷的倾向,这对地球的热量平衡是有利的。这与D项的内容相吻合。
转载请注明原文地址:https://kaotiyun.com/show/FJX7777K
0
大学英语六级
相关试题推荐
Directions:Forthispart,youareallowed30minutestowriteanessaycommentingonhowtohelpwithstudents’interpersonalr
重阳节(theDoubleNinthFestival),在每年的农历九月初九,是中国的传统节日。早在战国时期(theWarringStatesPeriod)人们就开始过重阳节,到了唐代,重阳成为全国性的民间节日。攀登高山是重阳节一项重要的习俗,
Fertilizerusehasexploded,overloadingplantsworldwide,likelyalteringecosystemsfordecadestocenturies,scientistsrepor
Withincreasingprosperity,WesternEuropeanyouthishavingaflingthatiscreatingdistinctiveconsumerandculturalpatterns
VideogameshavebecomeincreasinglypopularinbotharcadesandtheaverageAmericanhome.Peopleofallagesandfromallwalk
A、Fromaspecialseminar.B、Fromaculturaldocumentary.C、Fromwhatshejustread.D、FromherCanadianfriend.C①选项均以From开头,因此推
A、Toorganizeactivitiesforchildren.B、Toselllocalfarmproducts.C、Tobringtouriststothetown.D、Toraisefundfortheh
LatinoyouthsneedbettereducationforArizonatotakefulladvantageofthepossibilitiestheirexplodingpopulationoffers.A
A、You’dbettersmileorlaughfromthebottomofyourheart.B、Youcan’tfoolyourbodybypretendingtobehappy.C、Asmartmin
随机试题
A.三金片B.五苓散C.肾炎四味片D.茵陈五苓丸E.萆薜分清丸治肾不化气、清浊不分所致的白浊,宜选用的中成药是()
羧甲墓淀粉钠在片剂中作为乙醇在片剂制备中作为
《普通高中数学课程标准(实验)》指出:“学生对基础知识和基本技能的理解与掌握是数学教学的基本要求,也是评价学生学习的基本内容;评价要注重对数学本质的理解和思想方法的把握,避免片面强调机械记忆,模仿以及复杂技巧。”请分别给出评价学生基础知识与基本技能掌握情况
四面体ABCD涪棱DA,DB,DC剪开,将面ADB,面ADC和面BDC展开落在平面ABC上,恰好构成一个边长为1厘米的正方形AEGF(如图5所示),则原四面体的体积是()立方厘米.
A、∞B、0C、6D、一6D
AwaronsugarhasbegunintheUKthatechoesthenation’ssuccessfulcampaignagainstsalt.Theeffortis【C1】______becauseit
Thehousewasveryquiet,______asitwasonthesideofamountain.
Smokingisverypopularwithpeople.【C1】______ofthesmokersbelievethatsmokingcan【C2】______theirnerveshardenedwithsoci
A、Makecopiesofherarticle.B、Writeanessayforaliteratureclass.C、Takethemantoaplay.D、Introducethemantohercowo
Oneinsix.Believeitornot,that’sthenumberofAmericanswhostrugglewithhunger.Tomaketomorrowalittlebetter,"Feedi
最新回复
(
0
)