题目内容：
Questionsarebasedonthefollowingpassage. Biologistsbelievethatloveisfundamentallyabiologicalratherthanaculturalconstruct.Thatisbecausethecapacityforloveisfoundinallhumanculturesandsimilarbehaviourisfoundinsomeotheranimals.Butwhatdoessciencehavetosayaboutthenotionofloveatfirstsight?
Inrecentyearstheabilitytowatchthebraininactionhasofferedawealthofinsightintothemechanicsoflove.Researchershaveshownthatwhenapersonfallsinloveadozendifferentpartsofthebrainworktogethertoreleasechemicalsthattriggerfeelingsofeuphoria(愉快),bondingandexcitement.Ithasalsobeenshownthattheunconditionallovebetweenamotherandachildisassociatedwithactivityindifferentregionsofthebrainfromthoseassociatedwithsexual,pair-bondinglove.
Infact,thedesires,motivationsandwithdrawalsinvolvedinlovehaveagreatdealincommonwithaddiction.Whatthismeansisthatonespecialpersoncanbecomechemicallyrewardingtothebrainofanother.Loveatfirstsight,then,isonlypossibleifthemechanismforgeneratinglong-termattachmentcanbetriggeredquickly.
Therearesignsthatitcanbe.Onelineofevidenceisthatpeopleareabletodecidewithinafractionofasecondhowattractivetheyfindanotherperson.
Ayala,apsychologistatBen-GurionUniversity,alsofoundinasurveythatasmallfraction(11%)ofpeopleinlong-termrelationshipssaidthattheybeganwithloveatfirstsight.Itisalsoclearthatsomecouplesneedtoformtheirbondsoveralongerperiod,andpopularculturetellsmanytalesoffriendswhobecomelovers.
Onemightalsospeculatethatifapersonislookingforapartnerwithtraitsthatcannotbequantifiedinstantly,suchascompassion,intellectoragoodsenseofhumour,thenitwouldbehardtoformarelationshiponthebasisofloveatfirstsight.Thosemoreconcernedonlywithvisualappearances,though,mightfindthiseasier.Soitappearsthatloveatfirstsightexists,butisnotaverycommonbasis
forlong-termrelationships.
Howdobiologistsregardlove? A．Ithasnothingtodowithculture.
B．Itisbasicallyabiologicalconcept.
C．Itisonlyseeninsomehumancultures.
D．Itcannotbeexplainedbyscience.
参考答案：
答案解析：