Whenyoulookattheskyatnight,themoonlooksbiggerthanthestars.Actually,themoonismuchsmallerthanthestarsandthesun.It’smuchsmallerthantheearth.Butthemoonismuchclosertousthananystar.Thatiswhyitlooksso

　　Whenyoulookattheskyatnight,themoonlooksbiggerthanthestars.Actually,themoonismuchsmallerthanthestarsandthesun.It’smuchsmallerthantheearth.Butthemoonismuchclosertousthananystar.Thatiswhyitlookssobig.Ifyouholdacoinclosetoyoureye,itlooksbig.Ifyoulookatitacrossthemoon,itlookssmall.

　　Themoonmovesaroundtheearth.Itmakesonetripinaboutfourweeks.Themoonlooksflattous.Butitisaroundball,liketheearth.

　　Peopleoncethoughtthemoonhadfireonit.Theythoughtthefiremadeitbright.Nowweknowthemoonislikeamirror.Itgetsitslightfromthesun.

　　Oursunlightcomesfromthesun,too.Whatisthesun?Thesunisastar.Thestarswecanseehavetheirownlight.Therearemanybigstarswecannotsee.Theirlighthadburnedout.Othersarestillbright,buttheyaresofarawaythatwecannotseethem.Thesunlooksbiggerandmuchbrighterthanotherstarsbecauseitisthenearestofallstars.Thesunandtheotherstarsweseeareveryhot,buttheairaroundussavesusfromtheheatofthesun.

　　Thesungivesuslightandwarmth.Itmakesplantsgrowandturnsleavesgreen.Itmakeslifepossibleonourearth.Itisalifegivingstar.

　　小题1:Ittakes_______forthemoontogoaroundtheearth.A．morethanaweekB．nearlyamonthC．halfayearD．morethanayear小题2:Themoonisbrightbecause_______.A．thereissomefireonitB．itisnearthesun,tooC．thereisabigmirroronitD．itcangetlightfromthesun小题3:Thepassagetellsus_______.A．thesunisnotthebiggeststarB．thesunisbiggerthananyotherstarC．onlythesuncanshineD．thesunisoneofthefartheststarstous小题4:Whydowecallthesun"alifegivingstar"?A．Becauseitgivesuswarmth.B．Becausetherearesomelivingthingsonit.C．Becauseplantsandanimalscan’tlivewithoutit.D．Becausepeoplehavetoliveinthedarkwithoutit.