Whenwedonate(捐献)bloodasmallamountisusuallytakeninadvanceforatleastABOandRhsystemstyping.IfyouareO+theOisyourABOtypeandthe+isyourRhtype.ItispossibletobeABABorOaswellasRh+orRh-.
TheABOsystemwasdiscoveredbyKarlLandsteinerintheearly1900s.HewasawardedtheNobelPrizeforhisachievements.TherearefourbasictypesofbloodintheABOsystem:ABABandO.Everybodyisbornwithoneofthesefourtypesofblood.Wegetbloodtypejustlikehaircolorandheightfromparents.Becauseofthesubstances(物质)containedineachtypethefourgroupsmustbetransfusedcarefullyIftwodifferentbloodtypesaremixedtogetheritmayputapersonintoanextremelydangeroussituation.BasicallyAandBcannotbemixed.AandBcannotreceiveABbutABmayreceiveAorB.InanemergencytypeObloodcanbegivenbecauseitismostlikelytobeacceptedbyallbloodtypessoitisoftencalledtheuniversaldonor.Howeverthereisstillarisk.FortheoppositereasonABissometimescalledtheuniversalreceiver.Howeverbecausetherecanbesomanyreactionsinthebloodbankofthehospital.
Thereisarelationshipbetweenyourbloodtypeandyournationality.AmongtheEuropeansabout45percenthavetypeOwhile42percenthavetypeA.TheleastcommonistypeAB.Otherraceshavedifferentpercentage.ForexamplesomeAmericanIndiangroupshavenearly100percenttypeOoutof100donorsintheworld.
1.Whichofthefollowingshownthecorrectrelationshipsinbloodtransfusions?
2.Theunderlinedword“transfuse”mostprobablymeans________.
A.toputthebloodintoacontainer
B.tomovethebloodfromoneplacetoanother
C.toputthebloodofonepersonintothebodyofanother
D.togivepowertoanotherperson
3.ThewritersuggeststhatthethirdmostcommonbloodtypeamongtheEuropeansis______.
A.BB.AC.ABD.O
4.Thetextmainlytellsus______.
A.aboutthebasictypesofhumanblood
B.whatkindofbloodisthemostcommon
C.aboutKarlLandsteinerwhowontheNobelPrize
D.therelationshipbetweenbloodtypeandnationality