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1、第二十讲 主旨大意题(1)(8min.)It'shardlysurprisingthatweatherisafavoritetopicforsomanypeoplearoundtheworld—itaffectswherewechoosetolive,whatwewear,ourmoods,andperhapsevenournationalcharacteristics.Studieshaveshownthatchangeableweathercanmakeitdifficulttoconcent
2、rate,cloudyskiesslowdownreaction,andhighhumiditywithhot,drywindsmakesmanypeoplebadtempered.IfyouliveinaplacelikeBritain,wheretheweatherseemstochangedailyifnothourly,youcouldbeforgivenforthinkingthattheweatherisrandom.Infact,theweatheriscontrolledbysys
3、temswhichmovearoundareasoftheglobe.IntheUKtheweatherdependsondepressions,oftencalledlows,andanticyclones,alsoknownashighs.ThesesystemsstartintheAtlanticOcean,andmaketheirwayacrosstheBritishIslesfromthewesttotheeast.Highsbringsunnyweather,whilelowsbrin
4、grainandwind.Inmoderntimes,humanactivitiesseemtobealteringweatherpatterns.GasesproducedbyheavyindustrychangethetemperatureoftheEarth'ssurface,andaffectcloudformation.SomeresearcherssaythatfactoriesinEuropeandNorthAmericamayhavebeenoneofthecausesofthed
5、roughtsinAfricainthe1980s.Thehumanracehasalwaystriedtoguesstheweather,especiallyinareasoftheworldwheretherearefrequentchanges.Traditionalrhymespointtoearlyattemptstoidentifyweatherpatterns,popularpoemsinclude：Redskyatnight,shepherds'delight;redskyinth
6、emorning,shepherds'warning.Flieswillswarm(云集)beforeastorm.Rainbefore7,clearby11.Whilefolkwisdomcanstillprovideaguidetohelpforecastweather,today'smethodsofpredictionincreasinglyrelyontechnology.Satellites,balloons,ships,aircraftsandweathercenterswithse
7、nsitivemonitoringequipment,senddatatocomputers.Thedataisthenprocessed,andtheweatherispredicted.However,eventhissystemcannotpredictweatherforlongerthanaboutaweek.1.Whenweatherkeepschanging,______.A.peoplebecomebadtemperedB.people'sreactionslowsdownC.pe
8、oplefindithardtofocusontheirworkD.peoplebecomehungrier2.Whatismainlytalkedaboutinthesecondparagraph?A.Changesinweather.B.WeatherinBritain.C.Africandroughts.D.Researchonweather. 3.TheweatherinBritainis______.4A.randomB.moistC.depressing
