初中英语演讲(主题：天气)

•Youralarmgoesoff.Anewdaybegins.Whatwillyouwear?Whatwillyoudo?•Youranswersdependontheweather.THERESTLESSAIR•Youprobablytalkabouttheweatheratleastonceeveryday.Justwhatisweather?Insimpleterms,weatheriswhatishappeningintheairaroundyou.WEATHER?atleast至少•Weatheraffectsourlivesinmanydifferentways.Airlinepilotsknowhowfastandfromwhatdirectionwindsareblowingbeforetheytakeoffandland.Peoplewhofishareawareofstormsbrewingoutatsea.Farmerswaitfordryweathertostartharvestingtheircrops.WEATHERaffect影响harvest收获crop庄稼WEATHERorCLIMATE•WeatherispoweredbythesunheatingEarth.ThisheatenergyisresponsibleforcreatingdifferentclimatesindifferentplacesonEarth.•Whileweatherchangesfromdaytoday,climateisaregion’sgeneralpatternofweatheroveralongperiodoftime.pattern模式InternationalKiteFestivalWEATHERFORECAST•Ifyouwanttoknowwhattheweatherwillbeliketomorrow,youcanfindaforecastinthenewspaper,onTV,oronInternet.Untilabout150yearsago,however,forecastsweremadebypeopleobservingtheirsurroundings.Theypaidalotofattentiontothecloudsandthewinds.•Today,forecastingtomorrow’sornextweek’sweatheristhejobofmeteorologists(气象学家),scientistswhostudytheweather.Modernweatherforecastingdependsoncollectingenormousamountsofinformation—allaroundtheworld.TORNADOTORNADO•Atornadoisaviolentstormwhosecentreisacloudintheshapeofafunnel(漏斗).Tornadoscanalwaysmakeverystrongcircularwinds.•Windsinsideatornadomayreachspeedsofmorethan400kilometersanhour.Atornadomaysuckupcars,trees,andevenbuildingsonlytosmashthembackdowntoEarth.Tornadosusuallylastlessthantenminutes.However,theycanleavebehindatrailofseveredestruction.AfteratornadoAfteratornadoADVICE•WEBSITETOVISIT:•1.NationalWeatherService:•2.TheWeatherChannel: