精读教案6.docx

精读教案6

第一篇：精读教案6Unit6JewelryTeachingTime:sixperiodsPartIPre-learningI.TeachingAimsBytheendofthislesson,studentsshouldbeableto:A.KnowthegeneralknowledgeaboutdifferentkindsofJewelryaswellasdiamond.B.Learntousethecommunicativeskillof“makinganapology”.C.Mastertheuseofarticle.D.Graspthewordsorphrasesrelatedtodiamond.II.TeachingImportantandDifficultPointsCulturalBackgroundA.Differentkindsofjewels:(precious)stones:arareandvaluablekindofmineral.宝石gem:apearlofmineralthathasbeencutandpolishedforuseasanornament.宝石，珠宝ruby:abrightredpreciousstone.红宝石sapphire:akindoftransparentpreciousstoneofabrightbluecolor.蓝宝石emerald:abrightgreenpreciousstone.祖母绿，绿宝石opal:apreciousstonewhichlookslikemilkywaterwithcolorsinit.蛋白石，猫眼石jade:aprecious,usuallygreenstonefromwhichornamentsorjewelryaremade.玉，翡翠amber:ayellowishbrownhardclearsubstanceusedforornamentsorjewelry.琥珀jet:ahard,blackmaterialthatcanbemadetoshinebrightlyusedtomakeornaments.黑玉topaz:atransparentyellowishmineral.黄晶，黄玉pearl:ahardroundsmallsilvery-whitemassformedinsidetheshellofshellfish.珍珠B.DiamondsDiamond(金刚石，钻石)isaclear,veryhardandvaluablestone,usedinjewelryandinindustry,forexample,adiamondengagementring.ItisthebirthstoneofAprilandanniversarygemstoneforthe10thand60thyearsofmarriage.Diamondwasdiscoveredin500B.C.inIndia.Thename“diamond”comesfromtheGreekword“adamas”whichmeansunconquerable---suggestingtheeternity(永恒)oflove.SinceancientGreecediamondhasbeenthetraditionalsymboloflove.Theancientsbelievedtheywerehardeneddew(露水)drops,splinters(碎片)fromthestarsorcrystallizedlighting.Adiamond,thehardestsubstanceknowntoman,isacrystallizedcarbonwhichhasuniquepowersoflightreflection.Becauseitiscomposedofasingleelement,adiamondisthepurestofallgemstones.Diamondisacolorlessstone.Someotheroccasionalcolorsare:blue,yellow,amber(琥珀色的),red,green,pink.C.WorldproductionofnaturaldiamondsWorldnaturaldiamondproductionfor2003hasbeenestimatedatatotalofmillioncarats(1.克拉:宝石重量单位=200毫克2.开:黄金纯度单位,纯金为24开)withavalueofUS$9.4billion.About20%ofthisvolumearegems,whichwillbep