Unit6TheEarthsAtmosphere復(fù)習（北京課改版八年級下）

Unit6TheEarth’sAtmosphere本單元的重點知識：1.單詞：熟練掌握本單元后單詞的音、形、意2.詞組：1)bemadefrom 由……制造2)bemadeof 由……制造3)tinydropsofwater 小水滴4)reducewaste 減少浪費5)20milesthick 20英里厚6)protect…from 保護……免遭……7)bemadeupof 由……組成8)three—fourthsofthegases 3/4的氣體9)dependon 依靠10)stayalive 生存11)beusedto 習慣于12)drawworldwideattention 吸引世界注意13)blow…away 吹走14)befullof 充滿……15)beusedfor 用于做某事句子：1)Cloudsaremadeoftinydropswater.云是由小水滴構(gòu)成的。2)Theatmospheresurroundstheearthlikeablanket.大氣層像毯子一樣包裹著地球。3)Theatmosphereprotectstheearthfromthesun’sheat.大氣層保護地球免遭太陽的炙烤。4)Theairintheatmosphereismadeupofdustandgases.大氣層中的空氣是由塵土和各種氣體組成。5)Morethanthree-fourthsofgasisnitrogen.多于四分之三的氣體是氮氣。6)Plantsdependonnitrogentostayalive. 植物依靠氮氣來生存。7)Morethanthree-fourthsofthegasisnitrogen.氣體中四分之三的氣體都是氮氣。8)Peoplewhotraveltothemountainsfindithardertobreathe.到山上旅行的人發(fā)現(xiàn)這里呼吸比較困難。9)Bigcitiesarefullofcars.大城市里都是汽車。10)Theyareusedforbusinessandpleasure.他們是用來商務(wù)和娛樂的。11)Somethingshouldbedoneabouttheuseofcarsinordertohavecleanerair.為了得到更清潔的空氣，應(yīng)該就汽車的使用問題采取措施。六、本單元重點知識講解：1.Theshipismadefromwastematerials.TheT-shirtismadeofcotton.例如：①Thebookismadeofpaperandpaperismadefromwood.②TheglassismadeofglassandglassismadefromSiO2.2.Theairthatsurroundstheearthiscalledtheatmosphere.包圍地球的空氣被稱為大氣。becalled被稱為同義詞：benamed例如：Theboyiscalled“DaNiu”byhisclassmates.Themachineiscalled“Washingmachine”.Thatcitywillbecalled“WaterCity”.3.Itsurroundstheearthlikeablanket—20milesthick.20milesthick20英里厚數(shù)字+單位+形容詞例如：1.7metrestall一米七高6metreswide六米寬20kilometresaway20公里遠①Ourclassroomisthreemetrestall,7metreslongand6metreswide.②TheYellowRiveris5000kilometreslong.ItisthesecondlongestriverinChina.③Theriverisabout20metresdeep.Youmustn’tswiminit.It’stoodangerous!【典型例題】①Theruleris

（20厘米長）.②Thebookis

（5厘米厚）.③Theholeisabout

（50米深）.④Thetreeisnearly

（36米高）.4.Theatmosphereprotectstheearthfromthesun’tect…from保護……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，依賴例如：Thepeopleinthesouthdependonthegovernment.Thepandasdependonourgoodcare.Youcan’tdependonyourparentsforever.【典型例題】①ThesuccessoftheOlympicGame

（依賴）Chinesepeople’shardwork.②Thepoorchildren

（依靠）thoserichpeople’ssupport.6.Theairintheatmosphereismadeupofdustandgases.bemadeupof由……構(gòu)成，由……組成例如：Theclassismadeupof20boysand19girls.Theteacherteamismadeupof126teachers.7.Morethanthree—fourthsofthegasisnitrogen.three—fourths四分之三分數(shù)的概念：分數(shù)由基數(shù)詞作分子，序數(shù)詞作分母構(gòu)成，分母序數(shù)詞都用復(fù)數(shù)。8.Peoplewhotraveltothemountainsfindithardertobreathe.sb.findit+adj.+todosth.某人發(fā)現(xiàn)做某事怎么樣例如：Ifinditveryinterestingtotraveltotheforest.Theboysfinditverycooltosmoke.【典型例題】①我們發(fā)現(xiàn)早睡覺有好處。We

.②他發(fā)現(xiàn)游過這條河很難。Hefound

.9.Airpollutionhasdrawnworldwideattention.drawone’sattention引起某人的注意10.Bigcitiesarefullofcars.befullof…裝滿……，充滿……Thebagfullofbooks.Theroomisfullofpeople.Exercise【典型例題】1）一屋子的煙。Theroom