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CHaveyouwonderedwhatyourpetsarefeeling?Whenyourdogwags（摇）itstail,doesthatmeanitishappy?AnewappcalledHappyPetscantellyouwhat’sgoingon.Theappusesartificialintelligence（AI）toanalyze（分析）thefacialexpressionsofcatsanddogs.Thenitcantellyouwhatbreed（品种）yourpetisandhowitisfeeling.Itcanshowthefivemostcommonfeelings—happy,angry,neutral,sadandscared.ResearchersattheUniversityofMelbourneinAustraliadevelopedtheapp.Thekeytechnologyusedintheappisfacialrecognition,acommonuseofAI.Wecanunlockourmobilephonesorentertrainstationswithfacialrecognitionreaders.Butthisisthefirsttimethatthetechhasbeenusedwithanimals.Theapp’sAIwasfirsttaughttorecognizeapictureofananimal.Then,itwastaughttorecognizethefacialfeaturesofcatsanddogs.Nextcamethemostimportantstep—teachingittodetect（察觉）emotionsbasedoncertainfacialfeatures.Forexample,ifadogtightensupitseyesandmouthwhilechangingthepositionofitsears,thismeansthedogisscared.Tomasterthreeaboveskills,theAIprogramhasto“saw”and“read”thousandsofexampleimagesfirst.Howaccurate（准确的）aretheresults?Theresearchersthinktheyaretrustworthy（可靠的）sincetheapphasbeentestedmanytimes.Interestingly,theyhavefoundthatcatsarehardertoreadthandogs.Inthefuture,theappmightalsobeabletoanalyzeapet’sbodytomakeitsreadingsmoreaccurate.（）21.Whodevelopedtheapp?A.ResearchersattheUniversityofMelbourneinAustralia.B.ResearchersattheMedicalSchoolofMelbourneinAustralia.C.ResearchersatPekingUniversity.D.ResearchersattheAnimalsCentreofMelbourneinAustralia.A（）22.WhatcantheHappyPetsdoaccordingtothepassage?A.Itcananalyzethefacialexpressionsofcatsanddogs.B.Itcantellyouwhatbreedyourpetisandhowitisfeeling.C.Itcans
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