职称英语卫生C级阅读理解题库2017职称英语卫生C级阅读理解题库greatworksareperformednotbystrengthbutbyperseverance.以下是小编为大家搜索整理的2017职称英语卫生C级阅读理解题库，希望对正在关注的您有所帮助!更多精彩内容请及时关注我们应届毕业生考试网!阅读理解下面有3篇短文，每篇短文后有5道题，请根据短文内容，为每题确定1个最佳选项。第一篇Late-nightDrinkingCoffeelovers,becareful.Havingaquick“pick-me-up”cupofcoffeelateinthedaywillinterruptyoursleep.Aswellasbeingastimulant(兴奋剂)，caffeineinterruptstheflowofmelatonin(褪黑激素),thebrainhormonethatsendspeopleIntoasleep.Melatoninlevelsnormallystarttoriseabouttwohoursbeforebedtime.Levelsthenpeakbetween2amand4am,beforefallingagain.“It’stheneurohormone(神经激素)thatcontrolsoursleepandtellsourbodywhentosleepandwhentowake,”saysMauriceOhayonoftheStanfordSleepEpidemiologyResearchCenteratStanfordUniversityinCalifornia.ButresearchersinIsraelhavefoundthatcaffeinatedcoffeehalvesthebody’slevelsofthissleephormone.LotanShiloandateamattheSapirMedicalCenterinTelAvivUniversityfoundthatsixvolunteerssleptlesswellafteracupofcaffeinatedcoffeethanafterdrinkingthesameamountofdecaf(脱咖啡因咖啡).Onaverage,subjectsslept336minutespernightafterdrinkingcaffeinatedcoffee,comparedwith415minutesafterdecaf.Theyalsotookhalfanhourtodropoff,twiceaslongasusual.Inthesecondphaseoftheexperiment,theresearcherswokethevolunteerseverythreehoursandaskedthemtogiveaurine(尿)sample.Shilomeasuredconcentrationsofabreakdownproductofmelatonin.Theresultssuggestthatmelatoninconcentrationsincaffeinedrinkerswerehalfthoseindecafdrinkers.InapaperacceptedforpublicationinSleepMedicine，theresearcherssuggestthatcaffeineblocksproductionoftheenzyme(酶)thatdrivesmelatoninproduction.Becauseitcantakemanyhourstoeliminatecaffeinefromthebody,Ohayonrecommendsthatcoffeeloversswitchtodecafafterlunch.1Theauthormentions“pick-me-up”toindicatethat______.AmelatoninlevelsneedtoberaisedBneurohormonecanwakeusupCcoffeeisastimulantDcaffeinecanbalanceourbrainhormone答案：C解析：文中第一段第二句提到“Havingaquick“pick-me-up”cupofcoffeelateinthedaywillinterruptyoursleep”，说明在一天中的晚些时候喝一杯提神咖啡会