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
41
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://kaotiyun.com/show/FsJd777K
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
Opinionpollsarenowbeginningtoshowthat,whoeveristoblameandwhateverhappensfromnowon,highunemploymentisprobabl
Thepressisconstantlyremindingusthatthedramaticincreaseintheageofourpopulationoverthenext30orsoyearswillc
Somemoderncitiesareusuallyfamousforpeoplewholiveaverylongtime.
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
InthepasttwoyearsI’vephoned,e-mailedanddinedwiththreepotential"idealhusbands".(Thisisaccordingtotheauntsor
Nomatterwhatyoursituationis,oneofthegreatestdangersnowisthatyou’llstopdoingwhatyou’realreadydoingright.66.
WorldleadersmetrecentlyatUnitedNationsheadquartersinNewYorkCitytodiscusstheenvironmentalissuesraisedattheRio
ThepagesoftheHarvardBusinessReviewarenotusuallypopulatedbynovelists.ButJosephFinderisjustsuchararity.Recent
January题目中是setting-up时间,而短文中则以start来表述,尽管用词不同,意思是相同的。所以答案是January。注意此类题目会越来越多。
Whatarefeelingsfor?Mostnonscientistswillfindthisastrangequestion.Feelingsjustifythemselves.Emotionsgivemeaning
随机试题
下坡路制动失效后,在不得已的情况下,可用车身侧面擦撞山坡,迫使机动车减速停车。
用来全面管理计算机系统资源的软件叫__________。()
十进制数0.6875转换为二进制数为_______。
______determinesagoodmealvariesfromcountrytocountry.
气血亏虚、气不摄血引起的血证有
骨关节炎常见于以下哪些关节
一天,一位年轻的妈妈心急如焚地来找心理医生。心理医生招呼她坐下,她急不可待地对医生说:“医生,我的孩子4岁半了,近来表现一反常态。前几天,有位同学来到我家,问他:‘爸爸喜欢你还是妈妈喜欢你?’他说:‘爸爸喜欢你。’弄得这位尚未结婚的朋友(女)满脸尴尬。”“
某天,林伯的水果摊三种水果的价格分别为:苹果6元/斤,芒果5元/斤,香蕉3元/斤。当天,苹果与芒果的销售量之比为4:3,芒果与香蕉的销售量之比为2:11,卖香蕉比卖苹果多收入102元。林伯这天共销售三种水果()斤。
有人说:孤独是蚌病成珠。忍耐痛苦的结果是得到那颗美丽绝伦的珍珠,_________相反,乐于独处的人把独处看成难得的享受。独处,最有利于想象力的发挥。独对自然,心灵会像宇宙一样深邃;独观书籍,思想会像电波一样通达古今;独赏音乐,情绪会像雪莲一样玉洁冰清;独
下面列出了系统维护工作流程中的几个关键步骤,正确的工作顺序是(65)。①用户提交维护申请报告②交付使用③更新文档④测试⑤核实和评价维护申请报告⑥制定维护计划⑦实施维护
最新回复
(
0
)