六级阅读Speed Reading实战练习4.docx

六级阅读Speed Reading实战练习4.docx

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六级阅读SpeedReading实战练习4

六级阅读SpeedReading实战练习（4）

　　PassageFour

　　Ourgalaxyisagiganticagglomerationofstarsandplanetswhosenumberswillprobablyneverbeenknown.Currentlyweestimatethisnumbertobeaboutthirtybillion.Scientistshaveestimatedthatthediameterofourgalaxy,ifitweretobetraveled,wouldtakeusaboutfiftythousandlightyearsandthethicknesstobeaboutfifteentotwentylightyears.

　　WeliveinsmallpartoftheMilkyWayGalaxy,whichisreferredtoasasolarsystem.Oursolarsystemismadeupofnineplanetsand31moons,whichorbitthecenterofgalaxy.AtthecenterofourgalaxyisourSun,whichisapproximatelytwenty-fivethousandlightyearsfromoursolarsystem.

　　TheseninemajorplanetsinorderfromthecenterareMercury,Venus,Earth,Mars,Jupiter,Saturn,Uranus,Neptune,andPluto.

　　MercuryistheplanetnearesttotheSun.AsitorbitstheSun,itdoesnotrotate,keepingthesamefaceoftheplanettowardtheSunatalltimes.Thismeansthatonesideoftheplanethasacontinualburningdayof900°F,andtheothersideacontinualnightandadeadlycoldof450°Fbelowzero.MercuryisthefastesttravelingofthenineplanetsmakingonefullorbitaroundtheSuninonlyeightdays.Lifeonmercurywouldbeimpossible.Ifyoucouldlivewherethenightmeetsthedayandsurvivetheextremeconditions,youwouldneeddarkgogglestoprotectyoueyesfromtheextremelight.Mercuryhaslittleornoatmospheretodiffusethesunlight.Youwouldalsoweighconsiderablelessduetothelackofgravity.Apersonweighting100poundsonEarthwouldweigh27poundsonMercury.

　　LookingintothenightskyyouwillnoticeVenus,thebrighteststarinthesky,andthesecondplanetfromtheSun.VenuscanonlybeseenatcertaintimesofthedayeitheratdawnoratSunset.Inphysicalcharacteristics,Venusismostlikeearthwithadiameterofseventhousandsixhundredmiles,andgravitythesameasearth.Itislocatedadistanceofsixty-sevenmillionmilesfromtheSunandmakesonecompleteorbitaroundtheSunintwohundredtwentyfivedays.AsingledayonVenuscanlastuptotwohundredandtwentyfiveearthdaysduetoitsslowrotation.Theatmosphereappearstoconsistofmostlynitrogenandcarbondioxide.Thisisduetothelackoflifeontheplanet.

　　ThebesttimetoviewVenuscomeseveryonehundredandtwentyyearsasitpassesbetweentheEarthandtheSun.ThelasttimetobestviewitwasonJune7,2004.

　　Earth,thethirdplanetformtheSunisourhomeplanet.Earthistheonlyplanetinoursolarsystemknowntosustainlife.Underthelayerofatmospherethatsurroundstheplanetweareabletoprovideallthenecessarycomponentstomakelifesustainable.Earthisthefifthlargesplanetinthesolarsystem.ItsdiameterisjustafewhundredkilometerslargerthanVenus.Earthrotatesonitsaxisonecompleterevolutioninatwenty-fourhourperiodandorbitstheSuninthreehundredandsixtyfivedays.

　　MarsisthefourthplanetfromtheSunandistheclosestneighbortoearth.EveryseventeenyearsMarsreachesitsclosestpointtoearthinitsorbitaroundtheSunatthirty-fivemillionmiles.

　　Marsisasmallplanetthathasaredglow.ItmakesonecompleteorbitaroundtheSuninsixhundredandeightysevendays.OxygenandwatervaporhavebeendetectedintheatmosphereofMars,andayellowishfogandcloudsmovearoundtheplanetindicatingthattheplanethasdifferenttypesofweatherandseasonsliketheearth.AsingledayonMarsisverymuchlikeadayonearthlastingtwenty-fourhoursandthirty-sevenminutes,however,ayearonMarsistwiceaslongasoneyearonearth.

　　JupiterthefifthplanetfromtheSungetsitsnamefromtheFatheroftheGreekGods.Jupiter,whichorbitsfourhundredeighty-threemillionmilesfromtheSun,isthebiggestofalltheplanetsinoursolarsystem.Ithasadiameterofeighty-ninethousandmilesandavolumeofthirteentimesthatofearth.JupiterorbitstheSuneverytwelveyears.Itsatmosphereisthousandsofmilesthickandismadeupofmainlyhydrogen.Thesurfacetemperatureisabout-205°F.TherearenoseasonsonJupiter,butithasfloatingcloudsofammoniaandmethanegas.

　　JupiterhasabrightreddistinctivespotthatismorethantwiceaswideasEarth.ThismarkhasastronomerspuzzledbecausethereisnoreasonforthebrightspotduetothefactthatitdoesnotreceivemuchSunlight.ThisspotenablesustoseethatJupiterhasaveryfastrotation.Onerotationiscompletedeverytenhours.Theforcesplacedontheplanetduetothisquickrotationcausethecloudsattheequatortobulgelikeatire,butduetothegravitationalforcesoftheplanetkeepthecloudsfrombeingcastintospace.

　　Saturn,eventhoughitisthesixthplanetformtheSun,itshinessobrightlybecauseofitssize.Itsdiameterisseventy-onethousandfivehundredmiles.Theplanetitselfisgoldenincolorandisthebrightestyellowstarinthenightsky.

　　Saturnmakesonecompleterevolutiononitsaxiseverytenhoursandtakestwenty-nineandonehalfdaystocompleteoneorbitaroundtheSun.ThegravitationalpullofthisplanetismostlikethatofJupiter.Ithasavolumethatiseighthundredtimesthatofearth,buthasavolumethatisonehundredtimeslighterthanearth.

　　Saturnhastworingsthatsurroundtheplanet,butnevertouchit.Theyarelocatedoutsidetheatmosphereandabovetheequator.Theseringsareonlyabouttenmilesthick,whichmakesthemtransparent,onlybeingseenwiththeuseofatelescope.Theringclosesttotheplanetisaboutseventhousandmilesandverythin.Ablackbandseparatestheinnerringfromtheouterring,whichiswiderandbrighter.Itisbelievedthattheringsaremadeupofcrystalsoficeordustparticles.

　　UranusistheseventhplanetformtheSun.ThenameUranuscomesfromGreekmythology.Uranuswasthe¨GodoftheHeavens.〃

　　UranusissituatedonethousandsevenhundredandeightytwomilesformtheSunandcompletesoneorbitaroundtheSuneveryeighty-fouryears.Thesizeofthisplanetisfourtimesthatofearth,buthasthesameforceofgravityonthesurfaceasearth.Therearefivemoonsthatorbitthisplanet.ThelargestoneisTitania.

　　Neptune,theeighthplanetfromtheSun,isinvisibletothenakedeye.Itislocatedsometwothousandsevenhundredandninety-threemillionmilesformtheSun.AsingleorbitaroundtheSuntakesonehundredandsixty-fiveyeastocomplete.Thisplanetonlyreceivesonenine-hundredthoftheheatandSunlightastheearth.

　　PlutowastheninthplanetfromtheSun.ThenamePlutocomesfromtheRomanGodwhowastheruleroftheunderworld.OnThursday,August24,2006,however,theInternationalAstronomicalUnion（IAU）metinPraguevotedfinalizingtheguidelinesofplanetaryclassification,thusreorganizingPlutointoanewcategoryof"dwarfplanet".

　　PlutoislocatedthreethousandsixhundredandseventymillionmilesformtheSun.ItorbitstheSunintotaldarkness,andisaboutthesamesizeasMarsandhasadiametertwothirdsthatofEarth'smoon.DuetothedistanceandsizeofPluto,itcanonlybeseenwiththeuseofatwenty-inchtelescope.

　　PlutodisqualifiedduetoitseccentricorbitthatcrosseswithNeptune.Inadditiontothefactthatitisdisproportionatelysmallerthananyofitsformercounterpartsinthesolarsystem,itdoesnotqualifyasaplanet.Otherwise,wemightaswellqualifyPluto'smoon,Charonasaplanet,thusmakingPlutoandCharonabinaryplanetsystem.

　　1.Ifwearetotravelfromoneendofthegalaxycircletotheotheratthespeedoflight,itwouldtakeusfiftythousandlightyears.

　　2.TherecannotpossiblybeanyformofwaterinMercury.

　　3.Venusissharingwiththeearthsimilardiameter,similargravityandsimilarrotation.

　　4.ThespeedwithwhichMarstravelsroundtheSunistwiceasfastasthatoftheearth.

　　5.Jupiterhasanatmosphere,which,unlikethatofearth,containsforthemostpart_____________.

　　6.DespitethequickrotationofJupiter,itscloudsarestillclingingtotheplanetwiththehelpof__________________.

　　7.betweentheinnerringandtheouterringofSaturnthereisa___________________.

　　8.Comparedwiththatoftheearth,thegravityforceonthesurfaceofUranusis_____________.

　　9.AccordingtotheInternationalAstronomicalUnion,Plutoisnolongerseenasaplanet;instead,itshouldbetermedas________________.

　　10.Itseccentricorbitandits_____________disqualifiedPlutoasaplanet.

【

Word是学生和职场人士最常用的一款办公软件之一，99.99%的人知道它，但其实，这个软件背后，还有一大批隐藏技能你不知道。

掌握他们，你将开启新世界的大门。

Tab+Enter,在编过号以后，会自动编号段落

Ctrl+D调出字体栏，配合Tab+Enter全键盘操作吧

Ctrl+L左对齐，Ctrl+R右对齐，Ctrl+E居中

Ctrl+F查找，Ctrl+H替换。

然后关于替换，里面又大有学问！

有时候Word文档中有许多多余的空行需要删除，这个时候我们可以完全可以用“查找替换”来轻松解决。

打开“编辑”菜单中的“替换”对话框，把光标定位在“查找内容”输入框中，单击“高级”按钮，选择“特殊字符”中的“段落标记”两次，在输入框中会显示“^P^P”，然后在“替换为”输入框中用上面的方法插入一个“段落标记”（一个“^P”），再按下“全部替换”按钮。

这样多余的空行就会被删除。

Ctrl+Z是撤销，那还原呢？

就是Ctrl+Y，撤销上一步撤销！

比如我输入abc,按一下F4,就会自动再输入一遍abc