高考英语阅读题训练及参考答案高考英语阅读题训练及参考答案Thetemperatureofthesunisover5000degreesFahrenheitatthesurface,butitrisestoperhapsmorethan16milliondegreesatthecenter．Thesunissomuchhotterthantheearththatmattercanexistonlyasagas,exceptatthecore．Inthecoreofthesun,thepressuresaresogreatagainstthegasesthat,despitethehightemperature,theremaybeasmallsolidcore．However,noonereallyknows,sincethecenterofthesuncanneverbedirectlyobserved．Solarastronomersdoknowthatthesunisdividedintofivelayersorzones．Startingattheoutsideandgoingdownintothesun,thezonesarethecorona,chromosphere,photosphere,convectionzoneandfinallythecore．Thefirstthreezonesareregardedasthesun’satmosphere．Butsincethesunhasnosolidsurface,itishardtotellwheretheatmosphereendsandthemainbodyofthesunbegins．Thesun’soutermostlayerbeginsabout10000milesabovethevisible(可见的)surfaceandgoesoutwardformillionsofmiles．Thisistheonlypartofthesunthatcanbeseenduringaneclipse(食)suchastheoneinFebruary1979．Atanyothertime,thecoronacanbeseenonlywhenspecialinstrumentsareusedoncamerasandtelescopestoshutouttheglareofthesun’srays．Thecoronaisabrilliant,pearlywhite,filmylight,aboutasbrightasthefullmoon．Itsbeautifulraysareasensationalsightduringaneclipse．Thecorona’sraysflashoutinabrilliantfanthathaswispyspikelike(一束束穗状)raysnearthesun’snorthandsouthpoles．Thecoronaisthickestatthesun’sequator．Thecoronaraysaremadeupofgasesstreamingoutwardattremendousspeedsandreachingatemperatureofmorethan2milliondegreesFahrenheit．Theraysofgasthinoutastheyreachthespacearoundtheplanets．Bythetimethesun’scoronaraysreachtheEarth,theyareweakandinvisible．1．Matteronthesuncanexistonlyintheformofgasbecauseofthesun’s______．A．sizeB．ageC．locationD．temperature2．Withwhattopicisthesecondparagraphmainlyconcerned?A．HowtheSunevolved．B．ThestructureoftheSun．C．WhyscientistsstudytheSun．D．ThedistanceoftheSunfromtheplanets3．Allofthefollowingarepartsofthesun’satmosphereEXCEPTthe______．A．coronaB．chromosphereC．photosphereD．core4．Accordingtothepassage,asthecoronaraysreachtheplanets,theybecome______．A．hotterB．clearerC