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1、英语必修2译林牛津版Unit2优质教案（第7课时）Period7GrammarandusageIITeachingAims:1.Newwordsandexpressions:note,iinterview,schedule,surprisingly,getinto.Theywouldreachtheairportanhourlater.Iwasgoingtoleave・Hewasseeingherlater.ThejourneythatwastochangeToby'slifestarted..・Colinwasabouttogetoffthecamel・••2.Ena
2、blethestudentstouseFutureinthePastcorrectly・3.HelpthestudentslearnhowtouseFutureinthePastcorrectly.TeachingImportantandDifficultPointsLearntheusageFutureinthePast.TeachingMethodsPractice;task-basedactivitiesTeachingAidsAtaperecorderandthemultimedia.教师看高考阅读理解、专题训练(和)、说明文的阅读(2)阅读下列短文，然后按要求
3、完成读写任务Microwavesmaybegreatatwarmingupfood,butwhataboutwarmingpeople?Usingmicrowavestodirectlyheatownersofaroomwouldsavemuchoftheenergywastedbyheatingwallsandfumiture.Anddespitepopularideasaboutmicrowaves,thistechniquewouldbesafe,accordingtoCharlesR.BurlieroftheMicrowaveResearchCenterinMa
4、rlborough,NewHampshire.Low-powermicrowavesonlypenetrate(贯穿)theskin(low-powermicrowavepenetrationinahamisabout0.2inches,forexample)andwithnonegativeeffects.Totestthisidea,Bufflersubjectedhimselftomicrowavesinaspecialroomusingastandard500-watt,2,459MHzmagnetron(磁控管).Hefoundthatapersonwills
5、tarttofeelwarmthatabout20milliwattspersquarecentimeter(mw./sq.cm.)；asatisfactoryfeelingofwarmthoccursbetween35and50mw./sq.cm.Bycomparison,apersonstandinginnoondaysummersunfeelstheamountof85mw•/sq.cm.Andafrozenmeatpieinyourmicrowaveovenreceivesabout1,000mw./sq.cm.Inhousesofthefuture,eachr
6、oomcouldbeprovidedwithitsownmagnetron,saysBuffler.Whenyousteppedintothelivingroom,forexample,amotiondetector（运动感应器）wouldturnonthemagnetron,fillingtheroomwithlow-powermicrowaves.Inthesamewaythatamicrowaveovenheatsupahamburger,butnottheplateitson,youwouldfeelwarmthfromthemicrowaveswithoutc
7、hangingthetemperatureofyourcoffeetable.Youcould,however,makeyourfavoriteeasychairevenmorecomfortablebytreatingitwitharadiation—absorbingchemical.Whileitmightbesometimebeforehomeownersarecomfortableenoughwiththeideatosetupwhole-bodymicrowaveheatersinhouses,Bufflersaysmicro
