阅读理解。Dogswag(摇摆)theirtailsindifferentdirectionsdependingonwhethertheyareexcitedandwantingtomoveforwardorthreatenedandthinkingofmovingbackastudyhasfound.ResearchersinItalyexaminedthe

　　阅读理解。

　　Dogswag(摇摆)theirtailsindifferentdirectionsdependingonwhethertheyareexcitedandwanting

　　tomoveforwardorthreatenedandthinkingofmovingbackastudyhasfound.

　　ResearchersinItalyexaminedthetailwaggingbehaviorof30dogscatchingtheirresponsestoarange

　　ofstimuli(刺激物)withvideocameras.Toconductthestudytheychose15maledogsand15femaleones

　　agedbetweenoneandsixyears.Thedogswereallfamilypetswhoseownershadallowedthemtotakepart

　　intheexperimentatBariUniversity.Thedogswereplacedinalargewoodenboxwithanopeningatthefront

　　toallowforthemtoviewvariousstimuli.Theyweretestedoneatatime.

　　TheresearchersledbyProfessorGiorgioVallortigaraoftheUniversityofTriestefoundthatwhenthe

　　dogswereshowntheirowners-apositiveexperience-theirtailswaggedenergeticallytotherightside.When

　　theywereshownanunfamiliarhumantheywaggedtotherightbutwithsomewhatlessenthusiasm.The

　　appearsofacatagaincausedaright-handsidewagalthoughwithlessintensityagain.Theappearanceofa

　　largeunfamiliardogsimilartoaGermanshepherdchangedthedirectionoftailwaggingtotheleft.Research

　　erssupposedthedogwasthinkingofmovingback.Whenthedogswerenotshownanystimulitheytended

　　towagtheirtailstotheleftsuggestingtheypreferredcompany.Whilethechangesinthetailwaggingwere

　　noteasilynoticedwithouttheaidofvideoitwasthoughtthatthefindingscouldhelppeoplejudgethemood

　　(心情)ofdogs.Computerandvideosystemsforexamplecouldbeusedbyprofessionaldogtrainersto

　　determinethemoodofdogsthattheywererequiredtoapproach.

　　1.Thevideocameraswereusedtocatchthedogs'responsesbecause_____.

　　A.itwaseasiertocatchthedogs'responsechangesinthetailwagging

　　B.thedogswereputinthewoodenboxesandtestedoneatatime.

　　C.theyenabledthedogs'ownerstoknowabouttheirdogs'habit

　　D.thedogswaggedtheirtailsindifferentdirectionswhentheywereindifferentmoods

　　2.Theunderlinedword"intensity"inthepassagemeans_____.

　　A.sur