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1、2014高考英語沖刺閱讀理解專項(xiàng)50-37AAmericanresearcherssaydrinkingteamayhelpstrengthenthebody’sdefensesystemagainstinfection（感染）.DoctorsatBrighamandWomen’sHospitalinBoston,Massachusetts,didthestudy.Theteamstudiedachemicalfoundinblack,green,oolongandpekoetea.Thischemicalisanaminoacid（氨基酸）calledL-theanine.Thescie
2、ntistssayitmayincreasethestrengthofgammadeltaTcells.That’stheletterT,notthedrink.GammadeltaTcellsarepartofthebody’sdefenses.First,theresearchersmixedsomeofthesecellswithantigens（抗原）foundintheaminoacid.Antigenshelpthebodyreacttoinfection.Thenthescientistsaddedsomebacteria（細(xì)菌）.Withintwenty-fourhours
3、,thecellsproducedalotofinterferon,asubstancethatfightsinfection.Cellsnotmixedwiththeantigensdidnotproduceinterferon.Inthesecondpartofthestudy,elevenpeopledrankfivetosixcupsofblackteaeveryday.Tenotherpeopledrankthesameamountofinstantcoffee.Thatisdriedcoffeemixedwithhotwater.Twoweekslater,andagaintw
4、oweeksafterthat,theresearcherstestedthebloodofalltwenty-onepeople.Theyalsolookedatwhathappenedwhentheyaddedbacteriatothebloodcells.Theyfoundthattheteadrinkersproducedfivetimesmoreinterferonaftertheystarteddrinkingtea.Thecoffeedrinkersdidnotproduceinterferon.DoctorJackBukowskiledthestudy.Hesaysthea
5、ntigensaddedtothegammadeltaTcellswereresponsiblefortheincreasedreactiontothebacteria.Hesaysthestudyalsoshowedthatthecellswereabletorememberthebacteriaandfightthemagainthenexttime.Earlierresearchalreadyhasfoundthatteacanhelppreventheartdiseaseandcancer.DoctorBukowskisaysthenewstudymustberepeatedwit
6、hmorepeople.Ifthefindingsprovetobetrue,hesays,thenteadrinkingmightalsohelpprotectagainstbacterialinfections.HesaystheaminoacidL-theaninecouldberemovedfromteaandusedasadrugtostrengthenthebody’sdefenses.1.Wemayknowfromthetextthat________canbefoundindifferentkindsoftea.A.GammadeltaTcellsB.L-theanineC
7、.interferonD.bacteria答案解析：答案為B。本題為推理題。由第一段“Theteamstudiedachemicalfound4inblack,green,oolongandpekoetea.ThischemicalisanaminoacidcalledL-theanine.”可知，在black,green,oolongandpekoetea里面發(fā)現(xiàn)了叫做L-theanine的化學(xué)成分。故答案為B。2.T
