题目内容：
阅读文章，回答题：DDoyouknowhowitiswhenyouseesomeoneyawnandyoustartyawningtoo?Orhowharditistobeamongpeoplelaughingandnotlaughyourself?Well,apparentlyit'sbecausewehavemirrorneurons(神经元）inourbrains.Putsimply,theexistenceofmirrorneuronssuggeststhateverytimeweseesomeoneelsedosomething,ourbrainsimitate(模仿)it,whetherornotweactuallyperformthesameaction.Thisexplainsagreatdealabouthowwelearntosmile,talk,walk,danceorplaysports.Buttheideagoesfurther:mirrorneuronsnotonlyappeartoexplainphysicalactions，theyalsotellusthatthereisabiologicalbasisforthewayweunderstandotherpeople.
Mirrorneuronscanundoubtedlybefoundalloverourbrains，butespeciallyintheareaswhichrelatetoourabilitytouselanguages，andtounderstandhowotherpeoplefeel.Researchershavefoundthatmirrorneuronsrelatestronglytolanguage.Agroupofresearchersdiscoveredthatiftheygavepeoplesentencestolistento(forexample:"Thehandtookholdoftheball"),thesamemirrorneuronsweretriggeredaswhentheactionwasactuallyperformed(inthisexample,actuallytakingholdofaball).
Anyproblemswithmirrorneuronsmaywellresultinproblemswithbehavior.Muchresearchsuggeststhatpeoplewithsocialandbehavioralproblemshavemirrorneuronswhicharenotfullyfunctioning.However,itisnotyetknownexactlyhowthesediscoveriesmighthelpfindtreatmentsforsocialdisorders.
Researchintomirrorneuronsseemstoprovideuswithevermoreinformationconcerninghowhumansbehaveandinteract(互动).Indeed,itmayturnouttobetheequivalent(相等物)forneuroscienceofwhatEinstein'stheoryofrelativitywasforphysics.Andthenexttimeyoufeeltheurgetocoughinthecinemawhensomeoneelsedoes—well,perhapsyou'llunderstandwhy. A．whywecrywhenwearehurt
B．whywecoughwhenwesufferfromacold
C．whywesmilewhenweseesomeoneelsesmile
D．whyweyawnwhenweseesomeoneelsestayuplate
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