牛津小学英语课件Unit2　美丽的彩虹.pptx

OxfordElementarySchoolEnglishCoursewareUnit2目录contentsIntroductiontoRainbowLearningRainbowWordsRainbowDialoguePracticeExpandingknowledgeofrainbows01IntroductiontoRainbow TheFormationofRainbowsRainbowsareformedwhensunlightpassesthroughraindropsandreflectsintodifferentcolors.Therefractionandreflectionoflightinsideraindropssplitwhitelightintoitsconstituentcolors.Theobserverspositionandtheangleatwhichthesunisshiningarecrucialforviewingarainbow.Themostcommontype,withcolorsrangingfromredontheinsidetovioletontheoutside.PrimaryrainbowLessintensethantheprimaryrainbow,withcolorsreversedandabluearcinsidetheredarc.SecondaryrainbowVeryrareandoftendifficulttosee,withcolorsrangingfromviolettoindigoontheinsideofthesecondaryrainbow.TertiaryrainbowTypesofRainbowsInmanycultures,rainbowsareconsideredasymbolofhope,promise,andtranquility.Rainbowsareoftenassociatedwithmythsandlegends,suchasthelegendofNoahsArkorthestoryofthepotofgoldattheendoftherainbow.Rainbowscanalsobeasourceofinspirationforartistsandwriters,whooftenusethemasasymbolofbeautyandharmony.TheMeaningofRainbows02LearningRainbowWords总结词学习彩虹颜色的单词详细描述在Unit2中，学生将学习与彩虹颜色相关的单词，如red、orange、yellow、green、blue、indigo和violet。这些单词将通过生动的图片和例句进行讲解，帮助学生理解和记忆。LearningRainbowColorWords总结词学习与彩虹相关的单词详细描述除了颜色单词外，学生还将学习与彩虹相关的其他单词，如sunshine、rainbow、sky、rain等。这些单词将通过创设情境的方式进行讲解，帮助学生更好地理解单词的含义和应用场景。LearningRainbowRelatedWords练习彩虹单词的发音总结词为了帮助学生正确发音，Unit2还提供了丰富的彩虹单词发音练习。这些练习包括听录音跟读、单词发音分类和语音识别游戏等，旨在提高学生的口语表达能力和听力理解能力。详细描述Pronunciationexercisesforrainbowwords03RainbowDialoguePractice问答对话练习，关于彩虹的颜色。学生将通过问答形式，就彩虹的颜色进行对话练习。例如，“Whatcoloristherainbow?”“Whatcoloristhefirstbandoftherainbow?”等问题，帮助学生掌握彩虹的基本颜色。Q&ADialogueonRainbowColorsRainbowrelatedQ&Adialogue问答对话练习，与彩虹相关的问题。学生将进行一系列与彩虹相关的问答对话练习，如“Whatisarainbow?”“Howdorainbowsform?”等问题，以增强学生对彩虹的理解和描述能力。句子练习，描述彩虹。学生将通过完成句子练习，提高他们描述彩虹的能力。例如，“Therainbowisacircleofcolors.”“Therainbowappearsafterarainstorm.”等句子，帮助学生掌握描述彩虹的基本句型和词汇。Sentenceexercisesdescribingrainbows04ExpandingknowledgeofrainbowsTheformationofrainbowsRainbowsarecausedbytherefractionandreflectionofsunlightindropletsofwaterintheatmosphere,resultinginaspectrumofcolors.ThescientificexplanationofrainbowcolorsThecolorsofarainbowaredeterminedbythewavelengthoflight,withredlightappearingontheoutsideandvioletlightontheinside.TheroleoftheobserverThepositionoftheobserverrelativetothesunandraindropsaffectstheappearanceoftherainbow,withrainbowstypicallyonlyvisibleintheskyoppositethesun.ScientificknowledgeofrainbowsTheancientGreeksbelievedthatrainbowswerethegodswayofcommunicatingwithmortals.Insomecultures,rainbowsarethoughttoleadtoamythicalplacewhereallwishescometrue.Rainbowsareoftenassociatedwithlegendsandfairytales,symbolizinghopeandhappiness.TheMythicalStoryofRainbowsLinearperspectiveUsedtocreatetheillusionofdepthonatwo-dimensionalsurface,painterscanuselinearperspectivetomakerainbowsappeartorecedeintothedistance.ColortheoryUnderstandingcolortheoryisessentialforpainterstoaccuratelyrepresentthecolorsofarainbow,ensuringthatthecolorsblendharmoniously.LayeringtechniquesBylayeringpaint,painterscancreatetheillusionoftransparencyanddepthwithinarainbow,simulatingthewaylightpassesthroughdifferentlayersofatmosphere.ThePaintingTechniquesofRainbows感谢观看THANKS