2015职称英语考前冲刺第7讲

1均为细节题；完成句子基本解题思路:线索词定位法+空格前的接续词法thetiniestafractionofanthesameamountofanexplosionofhugethecreationofnewtheexistenceofblackBlackholesareformedafter Whenalargestarexplodes,thegravitycompactseverypieceinto Anewlyformedblackholeandthestaritcomesfromareof AlbertEinstein’stheoryofrelativityhelpstoprove AthetiniestB.afractionofanC.thesameamountof√DanexplosionofhugeEthecreationofnewFtheexistenceofblackBlackholesareformedafter BlackholesScientistshave

canbebestdescribedasasortofvacuum,suckingupeverything inspace.discoveredthatblackholescomefromhugestars.Starsthatareneardeathnolongerburnduetolossoffuel,hydrogenendsupputtingpressureontothestar’ssurfaceuntilitsuddenlyexplodesthencollapses.提示:如果题干中没有定位线索词⽆法定位相关句或者定位线索词及空格前的接续词/结构⽆法帮助定位相关句时,则可以利⽤被选项中的名词及名词短语帮助识别答案。√A.thetiniestB.afractionofanC.thesameamountofE.thecreationofnewF.theexistenceofblackWhenalargestarexplodes,thegravitycompactseverypieceinto 解题思路:Blackholescomefromstarsthataremadeofhydrogen,othergasesandafewmetals.theseexplodeitcanturnintoa lar-mass(恒星质量)blackhole,whichcanonlyoccurifthestarlargeenough(shouldbebiggerthanthesun)fortheexplosiontobreakitintopieces,andgravitystartstocompacteverypieceintothetiniestparticle.Trytoseeandcompare:ifastarthat’stentimesthesizeofthesunendsupbeingablackholethat’sonlyafractionofaninch!B.afractionofan√C.thesameamountofE.thecreationofnewF.theexistenceofblackAnewlyformedblackholeandthestaritcomesfromare 解题思路:Objectsthatgetsuckedinablackholewillalwaysremainthere,nevertobreak .Butrememberthatblackholescanonlygobbleup(吞噬)objectswithinaspecificdistancetoit.It’spossibleforalargestarnearthesuntoeablackhole,butthesunwillcontinuetostayin Orbits(轨道)donotchangebecausethenewlyformedblackholecontainsexactlythesameamountofmassaswhenitwasastar,onlythistimeitsmassistotallycontractedthatitcanendupasnobiggerthana典型考题分析：2013年理工A/BBlackB.afractionofanE.thecreationofnew√F.theexistenceofblackAlbertEinstein’stheoryofrelativityhelpstoprove 解题思路:Sofar,astronomershavefiguredoutthatblackholesexistbecauseofAlbertEinstein’stheoryofrelativity.Intheend,throughnumerousstudies,theyhavediscoveredthatblackholestrulyHaveyoueverriddenonaballoon?Manytouristspotsofferballoonridesinorderforpeopletoseethebeautyofacefromabove.Aballooncontainsanoblegascalledum(氦).Formerly,balloonscontainedhydrogenbuthydrogenisveryflbleanddangerouswhenuncontrolled.Therefore,peopleshiftedtohelium,whichissafer.Heliumissafebecauseithasthepropertiesofthenoblegases.Peopleoncebellevedthatnoblegasescouldn’tchemicallyreactatall.Forthisreason,theywerecalledinertgases(惰性气体).TheywerealsolistedunderGroup0intheoldperiodictablebecausescientistsbelievedthatthegaseshavezerovalence(价)electronsintheirouters.Thiswaslaterproventobeuntruewhensomenoblegascompoundswerediscovered.Thegasesareelements,whichsharesimilarproperties.Thesepropertiesincludebeingmonoatomic,colorless,odorless,beingabletoconductelectricity,andhavinglowchemicalreactivity.NoblegasesincludeHelium,Neon,Argon,Krypton,XenonandRadon.TheseareallfoundinGroup18,intherightmostcolumnoftheperiodictable.Ifyoulookattheperiodictable,youwillnoticethattheseelementsaretheonlyones,whichdonothaveacharge.Heliumhasthelowestmolecular(分子的)weightwhileRadonistheheaviest.Rememberthatchemicalreactionsoccurbecauseatomshavevalenceelectrons,whichareelectronsintheirouters.Whentheoutersis“unfilled”ortherequirednumberofelectronsisnotyetcomplete,theatomismorereactive.Noblegaseshaveafullouters,meaningthattheyhavecompleteelectronsintheirouters.Thiscompletenumbervaries.Forinstance,theoutersofHeliumhas2valenceelectronswhiletheoutersofXenonhas8electrons.Nowadays,thereremainstobeafewnoblegasesbecauseofthelowchemicalreactivityofthesesaidgases.becauseoftheirproperties,noblegaseshavemanyimportantapplicationsTheyarewidelyusedinmedicineandindustries.Forinstance,liquidHeliumisusedforsuperconductingmagnets(磁体).Thesemagnetsareveryimportantinphysicsandmedicine.Whenadoctorsthata’sbrainhasbeendamaged,hemightrequestforMagneticImaging(MRI).MRIallowsthedoctorto“see”thebrain,withoutoperatingontheNoblegasesarenotvery AmongtheelementsofnoblegasesHeliumis Therequirednumberofelectronsinnoblegases’outers MRImaymakeoperatingonthe √B.C.D.E.flNoblegasesarenotvery Haveyoueverriddenonaballoon?Manytouristspotsofferballoonridesinorderforpeopletoseethebeautyofacefromabove.Aballooncontainsanoblegascalledum(氦).Formerly,balloonscontainedhydrogenbuthydrogenisveryflbleanddangerouswhenuncontrolled.Therefore,peopleshiftedtohelium,whichissafer.Heliumissafebecauseithasthepropertiesofthenoblegases.Peopleoncebelievedthatnoblegasescouldn’tchemicallyreactatall.Forthisreason,theywerecalledinertgases(惰性气体).TheywerealsolistedunderGroup0intheoldperiodictablebecausescientistsbelievedthatthegaseshavezerovalence(价)electronsintheirouters.Thiswaslaterproventobeuntruewhensomenoblegascompoundswerediscovered.√A.AmongtheelementsofnoblegasesHeliumis Peopleoncebelievedthatnoblegasescouldn’tchemicallyreactatall（）Forthisreason,theywerecalledinertgases(惰性气体).TheywerealsolistedunderGroup0intheoldperiodictablebecausescientistsbelievedthatthegaseshavezerovalence(价)electronsintheirouters.ThiswaslaterproventobeuntruewhensomenoblegascompoundswereThegasesareelements,whichsharesimilarproperties.Thesepropertiesincludebeingmonoatomic,colorless,odorless,beingabletoconductelectricity,andhavinglowchemicalreactivity.NoblegasesincludeHelium,NeonArgon,Krypton,XenonandRadon.TheseareallfoundinGroup18,intherightmostcolumnoftheperiodictable.Ifyoulookattheperiodictable,youwillnoticethattheseelementsaretheonlyones,whichdonothaveacharge.Heliumhasthelowestmolecular(分子的)weightwhileRadonistheheaviest.C.√D.E. Therequirednumberofelectronsinnoblegases’outer Thegasesareelements,whichsharesimilarproperties.Thesepropertiesincludebeingmonoatomic,colorless,odorless,beingabletoconductelectricity,andhavinglowchemicalreactivity.NoblegasesincludeHelium,Neon,Argon,Krypton,XenonandRadon.TheseareallfoundinGroup18,intherightmostcolumnoftheperiodictable.Ifyoulookattheperiodictable,youwillnoticethattheseelementsaretheonlyones,whichdonothaveacharge.Heliumhasthelowestmolecular(分子的)weightwhileRadonistheheaviest（第三题判断答案的依据）.Rememberthatchemicalreactionsoccurbecauseatomshavevalence（价）electrons,areelectrons（电子）intheirouters.Whentheoutersis“unfilled”ortherequirednumberofelectronsisnotyetcomplete,theatomismorereactive.Noblegaseshaveafullouters,meaningthattheyhavecompleteelectronsintheirouters.Thiscompletenumbervaries.Forinstance,theoutersofHeliumhas2valenceelectronswhiletheoutersofXenonhas8electrons.Nowadays,thereremainstobeafewnoblegasesbecauseofthelowchemicalreactivityofthesesaidgases.C.E.flMRImaymakeoperatingonthepatientRememberthatchemicalreactionsoccurbecauseatomshavevalenceelectrons,whichareelectronsintheirouters.Whentheoutersis“unfilled”ortherequirednumberofelectronsisnotyetcomplete,theatomismorereactive.（第三题判断答案的依据）Noblegaseshaveafullouters,meaningthattheyhavecompleteelectronsintheirouters.Thiscompletenumbervaries.Forinstance,theoutersofHeliumhas2valenceelectronswhiletheoutersofXenonhas8electrons.Nowadays,thereremainstobeafewnoblegasesbecauseofthelowchemicalreactivityofthesesaidgases.becauseoftheirproperties,noblegaseshavemanyimportantapplications.Theyarewidelyusedinmedicineandindustries.Forinstance,liquidHeliumisusedforsuperconductingmagnets(磁体).Thesemagnetsareveryimportantinphysicsandmedicine.Whenadoctorsthata’sbrainhasbeendamaged,hemightrequestforMagneticResonanceImaging(MRI).MRIallowsthedoctorto“see”thebrain,withoutoperatingonthepatient.C.E.fl30.MRImaymakeoperatingonthepatientRememberthatchemic