阅读理解A
题干：Withsomuchfocusonchildrenuseofscreens,itiseasyforparentstoforgetabouttheirownscreenuse.“techisdesignedtoreallysuckyouin,”saysjennypedeskyinherstudyofdiitalplay,“anddigitalproductsaretheretopromotemaximalengagement.itmakesithardtodisengage,andleadstoalotofbleed-overintothefamilyroutine.”Pedeskyhasstudiedtheuseofmobilephoneandtabletsatmealtimesbygivingmother-childpairsafood-testingexercise.Shefoundthatmotherswhouseddevicesduringtheexercisestared20percentfewerverbaland39percentfewerbnonverbalinteractionwiththeirchildren.Duringaseparateobservationshesawthatphonesbecameasourceoftensioninthefamily.Parentswouldbelookingattheiremailswhilethechildrenwouldbemakingexcitedbidsfortheirattention.Infantsarewiredtolookatparentsfacestrytounderstandtheirworld,andifthosefacesareblankandunresponsive-astheyoftenarewhenabsorbedinadevice-itcanbeextremelydisconcertingforthechildren.Padeskycitesthe“stillfaceexperiment”devisedbydevelopmentalpsychologist.Edtronickinthe1970s.init,amotherisaskedtointeractwithherchildinanormalwaybeforeputtingonablankexpressionandnotgivingthemanyvisualsocialfeedback:thechildbecomesincreasinglydistressedasshetriestocapturehermother’sattention.“parentsdon’thavetobeexquisitelypresentatalltimes,butthereneedstobeabalanceandparentsneedtoberesponsiveandsensitivetobeachild’sverbalornonverbalexpressionsofanemotionalneed,”saysradesky.Ontheotherhand,tronickhimselfisconcernedthattheworriesaboutkid’suseofscreensatebornoutofan“oppressiveideologythatdemandsthatparentsshouldalwaysbeinteracting”withtheirchildren:“itisbasedonasomewhatfantasizedverywhite,veryupper-middle-classideologythatsaysifyou’refailingtoexposeyourchildto3000wordsyouareneglectingthem”tronickbelievesthatjustbecauseachildisn’tlearningfromthescreendoesn’tmeanthere’snovalueit-particularylyifgivesparentstimetohaveashower,dohouseworkorsimplyhaveabreakfromtheirchildparents,hesays,cangetalotoutofusingtheirdevicestospeaktoafriendorgetsomeworkoutoftheway.Thiscanmakethemfeelhappier,whichletsthemtobemoreavailabletotheirchildtherestofthetime.
题目：
Radesky’s cites the “still face experiment” to show that（）.
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