下面我们结合高考真题对这种题型的解题技巧具体说明。
例1：（2020年高考英语全国I卷D篇，保留原题号，下同）
...
TheengineersattheMassachusettsInstituteofTechnology(MIT)havetakenitastepfurther—changingtheactualcompositionofplantsinordertogetthemtoperformdiverse,evenunusualfunctions....“We'rethinkingabouthowwecanengineerplantstoreplacefunctionsofthethingsthatweuseeveryday,”explainedMichaelStrano,aprofessorofchemicalengineeringatMIT.
Oneofhislatestprojectshasbeentomakeplantsglow(发光)inexperimentsusingsomecommonvegetables.Strano'steamfoundthattheycouldcreateafaintlightforthree-and-a-halfhours.Thelight,aboutone-thousandthoftheamountneededtoreadby,isjustastart.Thetechnology,Stranosaid,couldonedaybeusedtolighttheroomsoreventoturntreesintoself-poweredstreetlamps.
35.Whichofthefollowingcanbethebesttitleforthetext
A.Canwegrowmoreglowingplants
B.Howdowelivewithglowingplants
C.Couldglowingplantsreplacelamps
D.Howareglowingplantsmadepollution-free
【分析】
例2：（2020年7月高考英语浙江卷C篇）
Challengingworkthatrequireslotsofanalyticalthinking,planningandothermanagerialskillsmighthelpyourbrainstaysharpasyouage,astudypublishedWednesdayinthejournalNeurologysuggests.
30.Whichofthefollowingisthebesttitleforthetext
A.RetiredWorkersCanPickUpNewSkills
B.OldPeopleShouldTakeChallengingJobs
C.YourToughJobMightHelpKeepYouSharp
D.CognitiveFunctionMayDeclineAsYouAge
以上两例均是研究类的说明文，这类材料往往都会对研究目的或结论进行概括，这种概括性的句子就可以看作是主题句，找到目的和结论就能很好地找出对应的标题。
例3：（2020年高考英语全国II卷D篇）
Ihaveaspecialplaceinmyheartforlibraries.IhaveforaslongasIcanremember.Iwasalwaysanenthusiasticreader,sometimesreadinguptothreebooksadayasachild.Storieswerelikeairtomeandwhileotherkidsplayedballorwenttoparties,IlivedoutadventuresthroughthebooksIcheckedoutfromthelibrary.
Now,IseemychildrentakingtheirchildrentothelibraryandIlovethattheexcitementofgoingtothelibrarylivesonfromgenerationtogeneration.
Asanovelist,I'vefoundanewrelationshipwithlibraries.Iencouragereaderstogototheirlocallibrarywhentheycan'taffordtopurchaseabook.Iseelibrariesasasafehaven(避风港)forreadersandwriters,abridgethathelpsputtogetherareaderwithabook....
35.Whichcanbeasuitabletitleforthetext
A.Reading:ASourceofKnowledge
B.MyIdeaaboutWriting
C.Library:AHavenfortheYoung
D.MyLoveoftheLibrary
例4：（2020年高考英语全国III卷D篇）
Wearetheproductsofevolution,andnotjustevolutionthatoccurredbillionsofyearsago.Asscientistslookdeeperintoourgenes(基因),theyarefindingexamplesofhumanevolutioninjustthepastfewthousandyears.PeopleinEthiopianhighlandshaveadaptedtolivingathighaltitudes.Cattle-raisingpeopleinEastAfricaandnorthernEuropehavegainedamutation(突变)thathelpsthemdigestmilkasadults.
OnThursdayinanarticlepublishedinCell,ateamofresearchersreportedanewkindofadaptation—nottoairortofood,buttotheocean.Agroupofsea-dwellingpeopleinSoutheastAsiahaveevolvedintobetterdivers....
Dr.JubiladofirstmettheBajauwhilegrowinguponSamalIslandinthePhilippines.Theymadealivingasdivers,spearfishingorharvestingshellfish.“Weweresoamazedthattheycouldstayunderwatermuchlongerthanuslocalislanders,”Dr.Jubiladosaid.“Icouldseethemactuallywalkingunderthesea.”
In2015,MelissaIlardo,thenagraduatestudentingeneticsattheUniversityofCopenhagen,heardabouttheBajau.Shewonderedifcenturiesofdivingcouldhaveledtotheevolutionofphysicalcharacteristicsthatmadethetaskeasierforthem....