题目内容：
根据以下材料，回答题Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken(31)_______.peoplegetolder.
Mentalabilitydeclines(32)_______age.Thatisthesameforthebrainyandthedim--andnot(33)_______forhumans:itismeasurableeven(34)_______fruitflies.(35)_______mindsthatkeeplivelywillsufferlessthanthelazy.Ingeneral,themoreeducationyouhave,themoreproductive
yourold(36)_______willbe.
Some(37)_______declinefasterthanothers.Accordingtomoststudies,people'snumeri-calandreasoningabilitiesare(38)_______theirbestintheir20sandearly30s.(39)_______abilities--thosethatdependonknowledge--mayimprovewithage.
Formostworkers,decreasedabilitieswill(40)_______tolowerproductivity;onlyaminor-itywillfindknow-howandknowledgeoutweighstheirfailingpowers.Eventhoseemployeeswhoremainhighlyproductivewillbelikelytoshineonlyinanarrow(41)_______Academicsnoticethis.Itislessclearthat
employersdo.Studiesofsupervisors'ratingsshownoclearcorrelation(42)_______ageandperceivedproductivity.Whenotheremployees'viewsare(43)_______intoaccountthough,the
picturechanges:theseratingssuggestthatworkersintheir30sarethe(44)_______productiveandhardworking,(45)_______scoresfallingthere-after.
Thatis(46)_______upbystudiesofworksamples,whichfmdlowerproductivityamongtheoldestemployees.AstudyforAmerica'sDepartmentofLaborshowedjobperformancepeakingat35,
and(47)_______declining.Itvariedbyindustry:thefallwas(48)infoot-wear,butfasterinfurniture.
Intellectualoccupationsarehardertomeasure,butthepictureisthesame.Academicsseemtopublish(49)_______astheyage.Painters,musiciansandwritersshowthesametendency.Theiroutput
peaksintheir30sand40s.Theonly(50)_______isfemalewriters,whoarem6stproductiveintheir50s.
参考答案：
答案解析：