阅读理解A
题干：Itisworthlookingatoneortwoaspectsofthewayamotherbehavestowardsherbaby.Theusualfondling,cuddlingandcleaningrequirelittlecomment,butthepositioninwhichsheholdsthebabyagainstherbodywhenrestingisratherrevealing.CarefulAmericanstudieshavedisclosedthefactthat80percentofmotherscradletheirinfantsintheirleftarms,holdingthemagainsttheleftsideoftheirbodies.Ifaskedtoexplainthesignificanceofthispreferencemostpeoplereplythatitisobviouslytheresultofthepredominanceofright-handednessinthepopulation.Byholdingthebabiesintheirleftarms,themotherskeeptheirdominantarmfreeformanipulations.Butadetailedanalysisshowsthatthisisnotthecase.True,thereisaslightdifferencebetweenright-handedandleft-handedfemales,butnotenoughtoprovideanadequateexplanation.Itemergesthat83percentofright-handedmothersholdthebabyontheleftside,butthensodo78percentofleft-handedmothers.Inotherwords,only22percentoftheleft-handedmothershavetheirdominanthandsfreeforactions.Clearlytheremustbesomeother,lessobviousexplanation.Theonlyothercluecomesfromthefactthattheheartisontheleftsideofthemother'sbody.Coulditbethatthesoundofherheart-beatisthevitalfactor?Andinwhatway?Thinkingalongtheselines,itwasarguedthatperhapsduringitsexistenceinsidethebodyofthemother,thegrowingembryo(胎儿)becomesfixated('imprinted')onthesoundoftheheartbeat.Ifthisisso,thenthere-discoveryofthisfamiliarsoundafterbirthmighthaveacalmingeffectontheinfant,especiallyasithasjustbeenthrustintoastrangeandfrighteninglynewworldoutside.Ifthisisso,thenthemother,eitherinstinctivelyorbyanunconsciousseriesoftrialsanderrorswouldsoonarriveatthediscoverythatherbabyismoreatpeaceifheldontheleftagainstherheart,thanontheright.Thismaysoundfar-fetched,buttestshavenowbeencarriedoutwhichrevealthatitisneverthelessthetrueexplanation.
题目：Most people think that mothers hold their babies in their left arms（）.
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