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 or four maps presents a continuous picture of weather
A weather map is an important tool for geographers. A succession of three or four maps presents a continuous picture of weather
admin
2011-05-29
49
问题
A weather map is an important tool for geographers. A succession of three or four maps presents a continuous picture of weather changes. Weather forecasters are able to determine the speed of air masses and fronts, 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 over a large geographical area at the time of observation. 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 which 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.
The thirty-day forecast is determined by examining ______.
选项
A、upper air levels
B、satellite reports
C、changing fronts
D、daily air maps
答案
A
解析
本文第二段最后一句明确指出“These 30-day outlooks are based upon an analysis of the upper air levels which often set the stage for the development of air masses,fronts,and storms”,所以本题的正确答案应当为 A。
转载请注明原文地址:https://kaotiyun.com/show/bW6O777K
0
考博英语
相关试题推荐
Wednesday’sSalesMeetingwillbegin15minutesearlierthanplanned—boardroomasusual.Whathaschanged?
Readthearticlebelowaboutcomputerindustry.Foreachquestion(23-28)ontheoppositepage,choosethecorrectanswer.Markon
AccountsClerkWanted£12,000peryear.Experienceanadvantage.Fulltrainingprovided.Immediateavailabilityessential.Cal
CYCLESMOVEWITHTHETIMESTimeshavebeenhardfortheUKcycleindustry.Poorweatherandcompetitionfromabroadhaveha
CYCLESMOVEWITHTHETIMESTimeshavebeenhardfortheUKcycleindustry.Poorweatherandcompetitionfromabroadhaveha
CYCLESMOVEWITHTHETIMESTimeshavebeenhardfortheUKcycleindustry.Poorweatherandcompetitionfromabroadhaveha
Readthefollowingminutesofameeting.Aresentences16-22ontheoppositepage’Right’or’Wrong’?Ifthereisnotenough
RoleofSecurityManagementinanIndustryTherearemanycompaniesprovidingyousolutionsforsecuritymanagement.Someof
Ifthestruggleforasustainablesociety_____,wemusthavesomevisionofwhatweareaimingfor.
Theappealtofilesensesknownas______isespeciallycommoninpoetry.
随机试题
决定资产评估业务应实行行业自律管理的是()
企业购并的动机主要包括()
"Wouldyoujoinusinthepicnicthisafternoon?""Oh,______,but1haveanappointment.
腹外疝好发于腹股沟区的主要原因是()。
麻疹疫苗第一次接种时间是
近年来,“低碳”一词随处可见。所谓“低碳生活”,就是指生活作息时所耗用的能量要尽量减少,从而降低碳,特别是二氧化碳的排放量,减少对大气的污染,减缓生态恶化。以下做法不符合低碳生活理念的一项是()。
企业在招聘员工时,要充分尊重求职者的选择权,以与求职者平等的姿态对待求职者,这是企业在进行员工招聘工作中应遵循的()。
固定资产报废的会计处理中,最终的净损益应作为()处理。
有以下程序:INPUTTOAS=0IFA=10S=1ENDIFS=2?S假定从键盘输入的A值是数值型,则程序的运行结果是
Learningdoesnothappenpassively.Itisanactivitythatapersondoes.Itisataskcanbeattemptedinvariousways,someof
最新回复
(
0
)