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1、Unit8PartTwoListeningIAlthoughtwinshavealwaysbeenasourceofcuriosity,theyarenotsouncommonstatistically,sincetheyoccuronceinevery86births.Aboutonethirdofalltwinsareidentical,orsingle-eggtwins.Identicaltwinshavethesamegenesand,hence,thesamesex,hair,eyes,bloodtype,andboneandtooth
2、structure.Someidenticaltwinsaremirrorimagesofeachother.Forexample,onemaybeleft-handed,theotherright-handed.Asyoungchildren,someidenticaltwinsmaydeveloptheirownprivatelanguage.Identicaltwinshaveanespeciallykeenintuition,andtheyoftenseemtothinkanddressalikeevenwhenawayfromeacho
3、ther.Infact,evenwhentheyareseparatedatbirthandraisedapart,identicaltwinsdevelopsurprisingsimilarities.Theymaypursuethesamecareers,havethesameinterests,ordiewithindaysofeachother.Incontrasttoidenticaltwins,fraternaltwinsinheritaseparatesetofgenesandarenotnecessarilyofthesamese
4、x.Exercise11.F2.F3.T4.F5.TExercise21.genes2.sex3.blood4.tooth5.mirror6.left-handed7.right-handed8.language9.young10.alike11.separated12.apart13.careers14.interestsListeningIIWhenRobertJones,19,wenttocollegethisfall,hewassurprisedthatsomanyofhisclassmatescalledhim"Edward".They
5、toldhimhelookedjustlikeaformerstudent,EdwardGallant,andafriendofGallant'sdiscoveredtheyhadthesamebirthdate.BothRobertandEdwardwereadopted.Whentheytalkedwitheachother,theydiscoveredthattheywereidenticaltwinsseparatedshortlyafterbirth.Infact,theywerewrong:Theyweretriplets.After
6、newspaperspublishedtheirpictures,Edward'smothergotacallfromDavidKellman."You'renotgoingtobelievethis,"hesaid,"butIbelieveI'mthethird."As"BabyA","BabyB"and"BabyC",Robert,EdwardandDavidhadbeenborntothesamemotheronJuly12,1976.Theywereadoptedbythreedifferentcouples,noneofwhomwast
7、oldtheirnewsonhadbrothers.Thereunionofthethreeboysafter19yearswasabigsurpriseforeveryoneinallthefamilies.Relativessaytheirresemblanceextendswellbeyondtheirlooks.Allthreelikeactivesportsandhavesimilartastesinrockmusicandgirlfriends.Allthreeareextrovertswhohavesimilargestures.T
8、heytalkinthesameway,theyhavethesamelaugh,theyholdtheircigarettesinth
