牛津译林版高中英语必修五Unit 3《Science and nature》阅读理解练习 .doc

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1、江苏省常州市西夏墅中学高中英语Unit3Scienceandnature阅读理解练习牛津译林版必修5阅读下面的短文，回答后面的问题。Americanresearcherssaydrinkingteamayhelpstrengthenthebody’sdefensesystemagainstinfection.DoctorsatBrighamandWomen’sHospitalinBoston,Massachusetts,didthestudy.Theteamstudiedachemicalfoundinblack,green,oolongandpekoetea

2、.ThischemicalisanaminoacidcalledL-theanine.ThescientistssayitmayincreasethestrengthofgammadeltaTcells.That’stheletterT,notthedrink.GammadeltaTcellsarepartofthebody’sdefense.First,theresearchersmixedsomeofthesecellswithantigensfoundintheaminoacid.Antigenshelpthebodyreacttoinfection.T

3、henthescientistsaddedsomebacteria.Withintwenty-fourhours,thecellsproducedalotofinterferon,asubstancethatfightsinfection.Cellsnotmixedwiththeantigensdidnotproduceinterferon.Inthesecondpartofthestudy,elevenpeopledrankfivetosixcupsofblackteaeveryday.Tenotherpeopledrankthesameamountofin

4、stantcoffee.Thatisdriedcoffeemixedwithhotwater.Twoweekslater,andagaintwoweeksafterthat,theresearcherstestedthebloodofalltwenty-onepeople.Theyalsolookedatwhathappenedwhentheyaddedbacteriatothebloodcells.Theyfoundthattheteadrinkersproducedfivetimesmoreinterferonaftertheystarteddrinkin

5、gtea.Thecoffeedrinkersdidnotproduceinterferon.DoctorJackBukowskiledthestudy.HesaystheantigensaddedtothegammadeltaTcellswereresponsiblefortheincreasedreactiontothebacteria.Hesaysthatthestudyalsoshowedthatthecellswereabletorememberthebacteriaandfightthemagainthenexttime.Earlierresearc

6、halreadyhasfoundthatteacanhelppreventheartdiseaseandcancer.DoctorBukowskisaysthenewstudymustberepeatedbymorepeople.“Ifthefindingsprovetobetrue,”hesays,“thenteadrinkingmightalsohelpprotectagainstbacterialinfections.”HesaystheaminoacidL-theaninecouldberemovedfromtheteaandusedasadrugto

7、strengthenthebody’sdefenses.1.Wemayknowfromthetextthat______canbefoundindifferentkindsoftea.A.L-theanineB.GammadeltaTcellsC.interferonD.bacteria2.Teamayhelpstrengthenthebody’sdefensesystembecauseithelps______.A.toaddsomebacteriatothebloodcellsB.thebodytoproducemoregammadeltaTcellsC.

8、thebodytoproducemor