【大学英语二2、5Youhavebeenbadlyinjuredinacaraccident.Itisnecessarytogiveyouabloodtransfusionbecauseyoulostagreatdealofbloodintheaccident.However,specialcareshouldbetakeninselectingnewbloodforyou.Iftheblood】

　　大学英语二2、5

　　Youhavebeenbadlyinjuredinacaraccident.Itisnecessarytogiveyouabloodtransfusionbecauseyoulostagreatdealofbloodintheaccident.However,specialcareshouldbetakeninselectingnewbloodforyou.Ifthebloodistoodifferentfromyourown,thetransfusioncouldkillyou.Therearefourbasictypesofblood:A,B,AB,andO.Asimpletestcanindicateaperson’sbloodtype,which,likehairandheight,isinheritedfromparents.Becauseofsubstancescontainedineachtype,thefourgroupsmustbetransfusedcarefully.Basically,AandBcannotbemixed.AandBcannotreceiveAB,butABmayreceiveAorB.Ocangivetoanyothergroup;henceitisoftencalledtheuniversaldonor.Fortheoppositereason,ABissometimescalledtheuniversalrecipient.However,becausesomanyreactionscanoccurintransfusions,patientsusuallyreceiveonlysaltorplasma(liquid)untiltheirbloodcanbematchedasexactlyaspossibleinthebloodbankofahospital.Inhisway,itispossibletoavoidanybadreactionstothetransfusion.Thereisarelationshipbetweenyourbloodtypeandyournationality.AmongEuropeansandpeopleofEuropeanancestry,about42percenthavetypeAwhile45percenthavetypeO.TherarestistypeAB.Otherraceshavedifferentpercentages.Forexample,someAmericanIndiangroupshavenearly100percenttypeO.

　　5)、MostEuropeanhavebloodtype_________

　　选项:

　　a、A

　　b、B

　　c、O

　　d、AorO

　　选哪个