测试题阅读理解.doc

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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