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1、2019-2020年高考英语二轮复习科普知识阅读理解（5）(I)科普知识（阅读理解）由(xx辽宁,C)改编Hereisanastonishingandsignificantfact:Mentalworkalonecan’tmakeustired.Itsoundsabsurd.Butafewyearsago,scientiststriedtofindouthowlongthehumanbraincouldlaborwithoutreachingastageoffatigue(疲劳).Totheamazementofthesescientists,
2、theydiscoveredthatbloodpassingthroughthebrain,whenitisactive,showsnofatigueatall!Ifwetookadropofbloodfromadaylaborer,wewouldfinditfulloffatiguetoxins(毒素)andfatigueproducts.ButifwetookbloodfromthebrainofanAlbertEinstein,itwouldshownofatiguetoxinsattheendoftheday.Sofarasthebra
3、inisconcerned,itcanworkaswellandswiftlyattheendofeightoreventwelvehoursofeffortasatthebeginning.Thebrainistotallytireless.Sowhatmakesustired?Somescientistsdeclarethatmostofourfatigueesfromourmentalandemotional(情感的)attitudes.OneofEngland’smostoutstandingscientists,J.A.Hadfiel
4、d,says,“Thegreaterpartofthefatiguefromwhichwesufferisofmentalorigin.Infact,fatigueofpurelyphysicaloriginisrare.”Dr.Brill,afamousAmericanscientist,goesevenfurther.Hedeclares,“Onehundredpercentofthefatigueofasittingworkeringoodhealthisduetoemotionalproblems.”Whatkindsofemotion
5、smakesittingworkerstired?Joy?Satisfaction?No!Afeelingofbeingbored,anger,anxiety,tenseness,worry,afeelingofnotbeingappreciated—thosearetheemotionsthattiresittingworkers.Hardworkbyitselfseldomcausesfatigue.Wegettiredbecauseouremotionsproducenervousnessinthebody.1.Whatsurprised
6、thescientistsafewyearsago?( )A.Fatiguetoxinscouldhardlybefoundinalaborer’sblood.B.AlbertEinsteindidn’tfeelwornoutafteraday’swork.C.Thebraincouldworkformanyhourswithoutfatigue.D.Amentalworker’sbloodwasfilledwithfatiguetoxins.2.Accordingtotheauthor,whichofthefollowingcanmakes
7、ittingworkerstired?( )A.Challengingmentalwork.B.Unpleasantemotions.C.Endlesstasks.D.Physicallabor.3.What’stheauthor’sattitudetowardsthescientists’ideas?( )A.Heagreeswiththem.B.Hedoubtsthem.C.Hearguesagainstthem.D.Hehesitatestoacceptthem.4.Wecaninferfromthepassagethatinorde
8、rtostayenergetic,sittingworkersneedto . A.havesomegoodfoodB.enjoytheirwor
