5、 837.InfamousexperimentconductedattheUniversityofChicagoin1983,ratskeptfromsleepingdiedafter ABC twoandahalfweeks. D 838.Drivingwhiletiredisverysimilartodrivedrunk,saysMichaelBonnet,directorofthesleeplaboratory ABCD attheDaytonV.A.MedicalCenter. 839.Nightworkershaveahardtimen
6、otpayattentiontothe9to5day,becauseofnoisesorfamily AB obligationsorthat%22stheonlytimetheycangotothedentist,saysbiologistKennthGroth,whostudies C thecircadianclockatArgonneNationalLaboratoryinLemont,Ill. D Answer.834.(A)835.(A)836.(A)837.(A)838.(C)839.(A) 840.LouisSatchmoArmstro
7、ngwasthemostfamousjazzmusicianofthedayandwoninternationalfame AB bothasatrumpetandasasinger. CD 841.Manypeoplesoughttobreakawayfromrigid,conventionalrulesandtraditions,justasjazztrumpeters