牛津小学英语课件Unit2　美丽的彩虹

Oxford ElementarySchoolEnglish CoursewareUnit2contents•Introduction toRainbow•Learning RainbowWords目录•Rainbow DialoguePractice•Expanding knowledgeof rainbows01Introduction toRainbowThe Formationof RainbowsRainbows are formedwhen Theobservers position and thesunlightpasses throughraindrops angleat whichthe sunis shiningandreflects intodifferent colors.are crucialfor viewinga rainbow.The refractionand reflectionoflight insideraindrops splitwhitelight intoits constituentcolors.Types ofRainbowsPrimary rainbowThemost commontype,with colorsranging fromred on theinside toviolet onthe outside.SecondaryrainbowLess intensethan theprimary rainbow,with colorsreversedand ablue arcinside thered arc.Tertiary rainbowVeryrare andoften difficultto see,with colorsranging fromvioletto indigoonthe inside of the secondaryrainbow.The Meaningof RainbowsInmany cultures,rainbows areconsidered a symbol ofhope,promise,andtranquility.Rainbowsareoften associatedwith mythsand legends,such asthe legendofNoahs Arkor thestory of the potof goldat theend of the rainbow.Rainbows canalso bea sourceof inspirationfor artistsand writers,whooften usethem asasymbolof beautyand harmony.02Learning RainbowWordsLearning RainbowColor Words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Learning RainbowRelated Words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Pronunciation exercisesfor rainbowwords总结词练习彩虹单词的发音详细描述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03Rainbow DialoguePracticeQA Dialogueon RainbowColors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，“What coloristhe rainbow”“What coloris thefirst bandofthe rainbow”等问题，帮助学生掌握彩虹的基本颜色Rainbow relatedQA dialogue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“What is a rainbow”“How dorainbows form”等问题，以增强学生对彩虹的理解和描述能力Sentence exercisesdescribing rainbows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，“The rainbowisacircle of colors.”“The rainbowappears aftera rainstorm.”等句子，帮助学生掌握描述彩虹的基本句型和词汇04Expanding knowledgeofrainbowsScientific knowledgeof rainbowsTheformation ofrainbowsRainbows arecaused by the refractionand reflectionof sunlightin dropletsofwater inthe atmosphere,resulting ina spectrumofcolors.The scientificexplanation ofrainbow colorsThecolors ofa rainboware determinedbythewavelength oflight,with redlightappearing onthe outsideand violetlight ontheinside.The roleoftheobserverThe positionoftheobserver relativeto the sun andraindrops affectstheappearance oftherainbow,with rainbowstypically onlyvisible inthe skyoppositethesun.The MythicalStory ofRainbowsThe ancientGreeks believedIn somecultures,rainbows Rainbowsare oftenthatrainbows werethe arethought tolead toa associatedwith legendsandgods wayof mythicalplace whereall fairytales,symbolizingcommunicating withwishes cometrue.hope andhappiness.mortals.The PaintingTechniques ofRainbowsLinear perspectiveUsedto create the illusion of depthonatwo-dimensional surface,painters canuse linearperspective tomakerainbows appearto recedeinto thedistance.Color theoryUnderstandingcolor theoryis essentialfor paintersto accuratelyrepresent the colors ofa rainbow,ensuring thatthecolorsblend harmoniously.Layering techniquesBylayering paint,painters cancreatetheillusionoftransparency anddepth withina rainbow,simulating theway lightpasses throughdifferent layersof atmosphere.THANKS感谢观看。