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时间:2020-03-19
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1、阅读下面的短文,回答后面的问题。Americanresearcherssaydrinkingteamayhelpstrengthenthebody’sdefensesystemagainstinfection.DoctorsatBrighamandWomen’sHospitalinBoston,Massachusetts,didthestudy.Theteamstudiedachemicalfoundinblack,green,oolongandpekoetea.Thischemicalisanaminoacidcall
2、edL-theanine.ThescientistssayitmayincreasethestrengthofgammadeltaTcells.That’stheletterT,notthedrink.GammadeltaTcellsarepartofthebody’sdefense.First,theresearchersmixedsomeofthesecellswithantigensfoundintheaminoacid.Antigenshelpthebodyreacttoinfection.Thenthescie
3、ntistsaddedsomebacteria.Withintwenty-fourhours,thecellsproducedalotofinterferon,asubstancethatfightsinfection.Cellsnotmixedwiththeantigensdidnotproduceinterferon.Inthesecondpartofthestudy,elevenpeopledrankfivetosixcupsofblackteaeveryday.Tenotherpeopledrankthesame
4、amountofinstantcoffee.Thatisdriedcoffeemixedwithhotwater.Twoweekslater,andagaintwoweeksafterthat,theresearcherstestedthebloodofalltwenty-onepeople.Theyalsolookedatwhathappenedwhentheyaddedbacteriatothebloodcells.Theyfoundthattheteadrinkersproducedfivetimesmoreint
5、erferonaftertheystarteddrinkingtea.Thecoffeedrinkersdidnotproduceinterferon.DoctorJackBukowskiledthestudy.HesaystheantigensaddedtothegammadeltaTcellswereresponsiblefortheincreasedreactiontothebacteria.Hesaysthatthestudyalsoshowedthatthecellswereabletoremembertheb
6、acteriaandfightthemagainthenexttime.Earlierresearchalreadyhasfoundthatteacanhelppreventheartdiseaseandcancer.DoctorBukowskisaysthenewstudymustberepeatedbymorepeople.“Ifthefindingsprovetobetrue,”hesays,“thenteadrinkingmightalsohelpprotectagainstbacterialinfections
7、.”HesaystheaminoacidL-theaninecouldberemovedfromtheteaandusedasadrugtostrengthenthebody’sdefenses.1.Wemayknowfromthetextthat______canbefoundindifferentkindsoftea.A.L-theanineB.GammadeltaTcellsC.interferonD.bacteria2.Teamayhelpstrengthenthebody’sdefensesystembecau
8、seithelps______.A.toaddsomebacteriatothebloodcellsB.thebodytoproducemoregammadeltaTcellsC.thebodytoproducemoreinterferonD.tomixantigenswithsomeofthecellsintheb
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