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
A weather map is an important tool for geographers. A succession of three of four maps presents a continuous picture of weather
A weather map is an important tool for geographers. A succession of three of four maps presents a continuous picture of weather
admin
2010-06-30
32
问题
A weather map is an important tool for geographers. A succession of three of four maps presents a continuous picture of weather changes. Weather forecasts are able to determine the speed of air masses and fronts; to determine whether an individual pressure area is deepening or becoming shallow and whether a front is increasing or decreasing in intensity. They are also able to determine whether an air mass is retaining its original characteristics or taking on those of the surface over which it is moving. Thus, a most significant function of the map is to reveal a synoptic picture of conditions in the atmosphere at a given time.
All students of geography should be able to interpret a weather map accurately. Weather maps contain an enormous amount of information about weather conditions existing at the time of observation over a large geographical area. They reveal in a few minutes what otherwise would take hours to describe. The United States weather Bureau issues information about approaching storms, floods, frosts, droughts, and all climatic conditions in general. Twice a month it issues a 30-day "outlook" which is a rough guide to weather conditions likely to occur over broad areas of the United States. These 30-day outlooks are based upon an analysis of the upper air levels with often set the stage for the development of air masses, fronts, and storms.
Considerable effort is being exerted today to achieve more accurate weather predictions. With the use of electronic instruments and earth satellites, enormous gains have taken place recently in identifying and tracking storms over regions which have but few meteorological stations. Extensive experiments are also in progress for weather modification studies. But the limitations of weather modification have prevented meteorological results except in the seeding of super-cooled, upslope mountainous winds which have produced additional orographical precipitation on the windward side of mountain ranges. Nevertheless, they have provided a clearer understanding of the fundamentals of weather elements.
At the present time, experiments are being conducted in ______.
选项
A、30-day "outlook"
B、controlling storms
C、satellites
D、manipulating weather
答案
D
解析
文中第三段第三句说“在改造天气的研究中人们进行了许多实验”,D项与此意相符,所以选项D为正确答案。
转载请注明原文地址:https://jikaoti.com/ti/mZnsFFFM
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
Genetherapyandgenebaseddrugsaretwowayswecouldbenefitfromourgrowingmasteryofgeneticscience.Buttherewillbeo
Writeanarticletitledas"KnowledgeEconomy".Youshouldwriteitaccordingtothefollowingoutline.Outline:(1)Anewkno
RecentsurveysshowthatJapaneseyouthhavebecomea"MeGeneration"thatrejectstraditionalvalues."Around1980manyJap
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【C1】______tothe
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
Averyimportantworldproblem—infact,Ithinkitmaybemostimportantofallthegreatworldproblemswhichfaceusatthepr
WorldleadersmetrecentlyatUnitedNationsheadquartersinNewYorkCitytodiscusstheenvironmentalissuesraisedattheRio
WorldleadersmetrecentlyatUnitedNationsheadquartersinNewYorkCitytodiscusstheenvironmentalissuesraisedattheRio
Government答案信息在第七句:DrKissingerenteredgovernmentserviceinl969。
Whathascloningbypassed?
随机试题
关于宪法的概念,下列说法中错误的是()
对洋地黄中毒后处理不正确的是
某建筑工地项目部组织脚手架坍塌应急演练活动前编制了《应急演练工作方案》。下列内容中不属于应急演练工作方案内容的是()。
应收账款评估以后,账面上“坏账准备”科目应为()。
大华公司2004年年初存货为15000元,年初应收账款为12700元,2004年年末计算出流动比率为3,速动比率为1.5,存货周转率为4次(按销售额计算),流动资产合计为27000元,公司的本年销售额是多少?如果除应收账款以外的速动资产是微不足道的,其平均
零售商业物业的现场管理是否成功,有多方面的影响因素,而()是基础。
自然常识课上,李老师为了让学生更好地理解水的“三态”变化,采用下列哪种教学方法最为合适?
结合材料回答问题:材料1保护生态环境必须依靠制度。要把资源消耗、环境损害、生态效益纳入经济社会发展评价体系,建立体现生态文明要求的目标体系、考核办法、奖惩机制。建立国土空间开发保护制度,完善最严格的耕地保护制度、水资源管理制度、环境保护
Bypersistentandsustainedpractice,anyoneandeveryonecanmaketheyogajourneyandreachthegoalofenlightenmentandfree
A、Writtenbychildrenthemselves.B、Tellingstoriesaboutthereaderhimself.C、Printedwithstandardthings.D、Publishedwitht
最新回复
(
0
)