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1、单元测评(四)Unit4Astronomy:thescienceofthestars（时间：90分钟满分：110分）第一部分阅读理解（共两节；满分30分）第一节（共10小题；每小题2分，满分20分）阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。AWhatsciencefiction(story)oncetoldaboutotherworldsfarawayisnowafact.Astronomers(expertsatthescienceoftheuniverse)proveanothersolar(ofthesun)systemlikeou
2、rswithsomeplanetsintheconstellationAndromeda(仙女座).GeoffreyMarcyisaprofessorofastronomyandphysicsatSanFranciscoStateUniversityandsays,“Whatwehavefoundnow,forthefirsttimeever,isindeedafully-grownsystem—ofplanetsaroundthestarUpsilonAndromeda.Itappearstohavethreeplanets,oneclosein,oneatami
3、ddledistance,andonefartherout.Thestarisslightlylargerthanoursun.Theplanetsarehuge,likeourJupiter(木星).”Marcy*spartnerinthisresearch,DebraFischer,describesthesolarsystem,“Herearetheinnerplanetthatgoesaroundevery46days,themiddleplanetthatgoesaroundevery242days,andthentheouterplanetthatgoe
4、saroundeverythreeandahalftofouryears.”Astronomically,it'snotfaraway,44lightyears・Thesunofthatsolarsystem,UpsilonAndromeda9issonearandbrightthatitcanbeseenbyusingnoequipmentduringsummerandfall.Fortwelveyearsastronomerssearchedtheskiesinthebeliefthatifoursunhasplanetsaroundit,surelyother
5、sdo,too.GeoffreyMarcysays,“Andthenstartingthreeandahalfyearsago,webeganflndingforthefirsttimeplanetssingly,oneplanetherearoundonestar..?9"WhenIlookupatthestarsnowatnight,Icanimagineeasilythateveryoneofthemhasplanetsaroundthem,”saysDebraFischer.Itwasatremble(shaking)inthestarthatledMarc
6、ytotheplanets."Thestarrocksaroundduetothegravityoftheplanetasadogownergetspulledaroundbyalittledog.”Cantheysupportlife?Wedon*tknow,becausepresenttechnologyisnotadvancedenoughtodeterminewhattheplanetsaremadeof.That,Marcysays,isastronomy'snextchallenge・1・What'stherelationbetweenAndromeda
7、(A),UpsilonAndromedasystem(U)andthementionedthreeplanets(P)?ABD答案与解析：B推理判断题。通读全文可知Andromeda是一个星座,像太阳系；UpsilonAndromeda是一颗恒星，像太阳；threeplanets是它的三个卫星，因此可推出B项正确。2・AccordingtoDebraFischer,inthenewsolarsystem,A・thefartheraplanetisfromthestar,thelongerittakestogoaroundthestarB・thelargerapl
