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1、北京2011各区县一模CD篇顺义（C）Comets (彗星)arepartsofoursolarsystem（太阳系）.Liketheplanets,theygoaroundthesun.Butcometsarenotmadeofsolidrocklikeplanets.Acometisaballofdust,stones,andice.Manypeoplecallcometsdirtysnowballs.The“snowball”maybeonlyafewmilesacross.Butwhenthesu
2、nheatsthe“snowball,”muchofitischangedtogases.Thegasesspreadoutandformthecomet’shead,whichmaybethousandsofmilesacross. Acometmovesfastinitstriparoundthesun.Butwhenweseeit,thecometdoesnotseemtomove.That’sbecauseitissofaraway.Themoonmovesfast,butwhenyoulook
3、atit,youcan’tseeanymotion.That’sbecausethemoonisfaraway.Socometsdonotrushacrossthesky.Youcannotseeanymotion.Butifyoulooknightafternight,youcanseethatacometchangespositionamongthestars.Ifyouwatchthemoonnightafternight,you’llseethatitalsochangesposition.Eac
4、hyearastronomersdiscovernewcomets.Someofthemareseenonlyonce.Theymakeonetriparoundthesunandthengowayoutintospace.Thesun’sgravity（重力、引力）cannotholdthem.Othercomets,likeHalley,keepreturning.Theyhavebeencapturedbythesun.Halley’searliestvisitwasprobably3,000yea
5、rsago.Itmaykeepreturningforanother3,000years.Buteverytimeacometgoesaroundthesun,thecometlosespartofitself.Gasesanddustarepulledoutofthecomet.That’swhyHalleyisnowdimmerthanitusedtobe.Nexttimeitvisitsus,in2062,itmaybeevendimmer.Eachvisititmaygetdimmeranddim
6、mer,untilitfinallydisappears.54.Whatisthispassagemostlyabout?A.Cometsandthesun. B.Whycometsarelikesnowballs.C.Whodiscoveredthefirstcomet． D.Factsaboutcomets.55.Accordingtothepassage,somecometshavebeen“capturedbythesun.”Whatdoestheunderlinedphras
7、emean?A.Thecometsarerushingintothesun.B.Thecometshavebeenbrightenedbythesun.C.Thecometsarestuckinthesun’sgravity.D.Thecometshavebeenburnedbythesun’sheat.56.Howdoestheauthorhelpthereaderunderstandwhatacometlookslike?A.Bytellingaboutafamousone. B.Byexpla
8、ininghowfarawayitis.C.Bydescribinghowfastitmoves. D.Bydescribingitasadirtysnowball.57.Whatisthemostlikelyreasontheauthorwrotethispassage?A.Togiveinformationaboutcomets.B.Totellreadersaboutfamouscomets.C.Toexplaint
