Dogswag(摇摆)theirtailsindifferentdirectionsdependingonwhethertheyareexcitedandwantingtomoveforwardorthreatenedandthinkingofmovingbackastudyhasfound.ResearchersinItalyexaminedthetailwaggingbehaviourof30

　　Dogswag(摇摆)theirtailsindifferentdirectionsdependingonwhethertheyareexcitedandwantingtomoveforwardorthreatenedandthinkingofmovingbackastudyhasfound.

　　ResearchersinItalyexaminedthetailwaggingbehaviourof30dogscatchingtheirresponsestoarangeofstimuli(刺激物)withvideocameras.Toconductthestudytheychose15maledogsand15femaleonesagedbetweenoneandsixyears.ThedogswereallfamilypetswhoseownershadallowedthemtotakepartintheexperimentatBariUniversity.Thedogswereplacedinalargewoodenboxwithanopeningatthefronttoallowforthemtoviewvariousstimuli.Theyweretestedoneatatime.

　　TheresearchersledbyProfessorGiorgioVallortigaraoftheUniversityofTriestefoundthatwhenthedogswereshowntheirowners—apositiveexperience—theirtailswaggedenergeticallytotherightside.Whentheywereshownanunfamiliarhumantheywaggedtotherightbutwithsomewhatlessenthusiasm.Theappearanceofacatagaincausedaright-handsidewagalthoughwithlessintensityagain.TheappearanceofalargeunfamiliardogsimilartoaGermanshepherdchangedthedirectionoftailwaggingtotheleft.Researcherssupposedthedogwasthinkingofmovingback.Whenthedogswerenotshownanystimulitheytendedtowagtheirtailstotheleftsuggestingtheypreferredcompany.Whilethechangesinthetailwaggingwerenoteasilynoticedwithouttheaidofvideoitwasthoughtthatthefindingscouldhelppeoplejudgethemood(心情)ofdogs.Computerandvideosystemsforexamplecouldbeusedbyprofessionaldogtrainerstodeterminethemoodofdogsthattheywererequiredtoapproach.

　　【小题1】Thevideocameraswereusedtocatchthedogs’responsesbecause .

　　A．itwaseasiertocatchthedogs’responsechangesinthetailwaggingB．thedogswereputinthewoodenboxesandtestedoneatatime.C．theyenabledthedogs’ownerstoknowabouttheirdogs’habitD．thedogswaggedtheirtailsindifferentdirectionswhentheywereindifferentmoods【小题2】Theunderlinedword“intensity”inthepassagemeans .A．surpriseB．worryC．excitementD．interest