Unit6TheEarthsAtmosphere复习（北京课改版八年级下）

Unit6TheEarth’sAtmosphere本单元的重点知识：1.单词：熟练掌握本单元后单词的音、形、意2.词组：1)bemadefrom 由……制造2)bemadeof 由……制造3)tinydropsofwater 小水滴4)reducewaste 减少浪费5)20milesthick 20英里厚6)protect…from 保护……免遭……7)bemadeupof 由……组成8)three—fourthsofthegases 3/4的气体9)dependon 依靠10)stayalive 生存11)beusedto 习惯于12)drawworldwideattention 吸引世界注意13)blow…away 吹走14)befullof 充满……15)beusedfor 用于做某事句子：1)Cloudsaremadeoftinydropswater.云是由小水滴构成的。2)Theatmospheresurroundstheearthlikeablanket.大气层像毯子一样包裹着地球。3)Theatmosphereprotectstheearthfromthesun’sheat.大气层保护地球免遭太阳的炙烤。4)Theairintheatmosphereismadeupofdustandgases.大气层中的空气是由尘土和各种气体组成。5)Morethanthree-fourthsofgasisnitrogen.多于四分之三的气体是氮气。6)Plantsdependonnitrogentostayalive. 植物依靠氮气来生存。7)Morethanthree-fourthsofthegasisnitrogen.气体中四分之三的气体都是氮气。8)Peoplewhotraveltothemountainsfindithardertobreathe.到山上旅行的人发现这里呼吸比较困难。9)Bigcitiesarefullofcars.大城市里都是汽车。10)Theyareusedforbusinessandpleasure.他们是用来商务和娱乐的。11)Somethingshouldbedoneabouttheuseofcarsinordertohavecleanerair.为了得到更清洁的空气，应该就汽车的使用问题采取措施。六、本单元重点知识讲解：1.Theshipismadefromwastematerials.TheT-shirtismadeofcotton.例如：①Thebookismadeofpaperandpaperismadefromwood.②TheglassismadeofglassandglassismadefromSiO2.2.Theairthatsurroundstheearthiscalledtheatmosphere.包围地球的空气被称为大气。becalled被称为同义词：benamed例如：Theboyiscalled“DaNiu”byhisclassmates.Themachineiscalled“Washingmachine”.Thatcitywillbecalled“WaterCity”.3.Itsurroundstheearthlikeablanket—20milesthick.20milesthick20英里厚数字+单位+形容词例如：1.7metrestall一米七高6metreswide六米宽20kilometresaway20公里远①Ourclassroomisthreemetrestall,7metreslongand6metreswide.②TheYellowRiveris5000kilometreslong.ItisthesecondlongestriverinChina.③Theriverisabout20metresdeep.Youmustn’tswiminit.It’stoodangerous!【典型例题】①Theruleris

（20厘米长）.②Thebookis

（5厘米厚）.③Theholeisabout

（50米深）.④Thetreeisnearly

（36米高）.4.Theatmosphereprotectstheearthfromthesun’tect…from保护……免遭例如：①Thethickcoatprotectsthebodyfromthecold.②Thehelmetprotectstheheadfromtherock.③Theplasticcoverprotectsthebookfrombeingbroken.5.Nothingcouldremainaliveontheearthwithouttheatmospheretoprotectup.Plantsdependonnitrogentostayalive.①remainalive存活stayalive存活例如：remainsilent staycalmremainstanding stayawakeremainthegoal staycoolremainweak stayquiet②dependon依靠，依赖例如：Thepeopleinthesouthdependonthegovernment.Thepandasdependonourgoodcare.Youcan’tdependonyourparentsforever.【典型例题】①ThesuccessoftheOlympicGame

（依赖）Chinesepeople’shardwork.②Thepoorchildren

（依靠）thoserichpeople’ssupport.6.Theairintheatmosphereismadeupofdustandgases.bemadeupof由……构成，由……组成例如：Theclassismadeupof20boysand19girls.Theteacherteamismadeupof126teachers.7.Morethanthree—fourthsofthegasisnitrogen.three—fourths四分之三分数的概念：分数由基数词作分子，序数词作分母构成，分母序数词都用复数。8.Peoplewhotraveltothemountainsfindithardertobreathe.sb.findit+adj.+todosth.某人发现做某事怎么样例如：Ifinditveryinterestingtotraveltotheforest.Theboysfinditverycooltosmoke.【典型例题】①我们发现早睡觉有好处。We

.②他发现游过这条河很难。Hefound

.9.Airpollutionhasdrawnworldwideattention.drawone’sattention引起某人的注意10.Bigcitiesarefullofcars.befullof…装满……，充满……Thebagfullofbooks.Theroomisfullofpeople.Exercise【典型例题】1）一屋子的烟。Theroom