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
2010-04-30
53
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 3℃ warmer in the year 2050 than it is today, if man continues to bum 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 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 50 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 influence 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, what might the warming effect of carbon dioxide be functioning as?
选项
答案
A useful counter-balance to the sun’s diminishing heat.
解析
转载请注明原文地址:https://jikaoti.com/ti/NhYMFFFM
0
大学英语六级
相关试题推荐
Mostpeoplewouldagreethat,althoughourageexceedsallpreviousagesinknowledge,therehasbeennotcorrespondingincrease
ToallAmericans,anotherbasic(36)______intheirconstitutionistheBillofrights,adoptedin1971.Thisconsistsof10ver
Tokyo—Japan,landoftheelectronicpetchicken,isfretting(发愁)overthepotentiallylethal(致命的)dangersthatgowiththelonel
OlympicTorchesEverytwoyears,peoplearoundtheworldwaitinanticipationasatorch-beatingrunnerenterstheOlympica
Forthispart,youareallowed30minutestowriteashortessayentitledWidespreadExtravagantSpendingonCampus.Youshould
Todefinesciencewemaysimplycallit______.Ascientistbeinginterestedinaddingtoourgeneralknowledgeaboutoxygenwo
A、Consumerswereresponsive.B、Consumerswerehostile.C、Consumersturnedcautiousofit.D、Consumersdidn’tcareallthetime.
A、Thelargenumberofpeoplewhowanttogetonlinedegrees.B、Thecountrieswhichprovideonlineeducation.C、Thecompanieswhi
A、In1938.B、In1946.C、In1955.D、DuringWorldWarII.BWhenwasthefirstCannesFilmFestivalheld?信息明示题。文章第一段指出,直到1946年才
strongcandidates根据题干中的grewpopular定位到原文第三段首句Thepopularityoftheproceduregrewsignificantlyinthe1990s,ascollegestriedt
随机试题
在零部件自制或外购决策时,如有剩余生产能力,且无其他用途。此时,固定成本属于
牛乳与人乳比较最大的缺点是
女性,23岁,青春期后无月经来潮。无明显体重减轻或过多体育锻炼史,无周期性下腹疼痛史。其姐妹月经初潮年龄均为13岁。查体:女性体态,身高165cm,体重63kg,血压110/60mmHg,颈软无包块。乳房发育好,未见皮肤异常变化。妇科检查:阴毛女性分布,大
下列关于《中华人民共和围文物保护法》,说法错误的是()。
在完成审计业务前,如果将审计业务变更为保证程度较低的鉴证业务,注册会计师认为合理的理由是()。
(2017·山东)学生已有的知识基础会影响当下的学习。()
许多人通过非法拷贝而不是购买为家中的计算机获得软件。但在过去的五年中,因为人们为家用计算机购买软件的平均数量显著增加,所以人们购买且用于家用计算机的平均非法拷贝软件的数量一定比以前少了。以下哪项如果为真.最能支持上述论证?
经过50多年的发展,我国台湾地区资本市场建立起由“证券交易所集中市场一上柜市场一兴柜市场”构成的完善成熟的多层次资本市场体系。近年由于金融海啸、欧债危机等冈素影响,台湾多层次资本市场总体成交值从2010至2012年连续3年下降,2012年较2011年衰退2
有以下程序:#include<stdio.h>main(){inti,j=0;chara口="Howareyou",b[10]={0};for(i=0;a[i];i++)if(a[i]=='')b[j++
删除查询将删除________。
最新回复
(
0
)