2019版高考英语unit18beauty夯练含解析北师大版选修6

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1、Unit18Beauty李仕才一、阅读理解。Canexerciseduringchildhoodprotectyouagainstmemorylossmanydecadeslater?Exerciseearlyinlifeseemstohavelifelongbenefitsforthebrain，inratsatleast.“Thisisananimalstudy，butitshowsthatphysicalactivityatayoungageisveryimportant—notjustforphysicaldevelopment，butfor

2、thewholelifelongtrackofcognitive(认知的)developmentduringageing，”saysMartinWojtowiczoftheUniversityofToronto，Canada.“Inhumans，itmaydelaytheappearanceofAlzheimer'sdisease(阿尔茨海默病)，possiblytothepointofpreventingit.”Wojtowicz'steamdivided80youngmaleratsintotwoequalgroups，andplacedrunn

3、ingwheelsinthecagesofonegroupforaperiodofsixweeks.Aroundfourmonthslater—whentheratshadreachedmiddleage—theteamtaughtalltheratstoconnectanelectricshockwithbeinginaspecificbox.Whenplacedinthebox，theyfrozewithfear.Twoweekslater，theteamtestedtheratsinthreesituations：exactlythesameb

4、oxinthesameroom，thesameboxwiththeroomarrangeddifferently，andacompletelydifferentboxinadifferentroom.Theratswithoutaccesstoarunningwheelwhentheywereyoungnowfrozethesamepercentageoftimesineachofthesesituations，suggestingtheycouldn'trememberwhichonewasdangerous.Butthosethathadbeen

5、abletorunintheiryouthfroze40to50percentlessinbothchangedboxsettings.“Theresultssuggesttheamountofphysicalactivitywhenwe'reyoung，atleastforrats，hasinfluenceonthebrainandcognitivehealth—intheformofbettermemories—whenwe'reolder，”saysArthurKramerofNortheasternUniversityinBoston，who

6、hasfoundthat，inhumans，exercisepromotesthegrowthofnewbraincells.1．Thestudyshowsthat________.A．physicalactivityisimportantforphysicalhealthB．usingtherunningwheelsisofbenefittotherats'growthC．physicalactivitycanpreventhumans'Alzheimer'sdiseaseD．themoreexercisearathaswhenyoung，theb

7、ettermemoryitwillpossesswhenolder2．HowareParagraph3and4mainlydeveloped?A．Byanalyzingcauses.B．Bygivinganexample.C．Bydescribingtheprocess.D．Byshowingdifferences.3．Whatdoestheunderlinedword“it”inParagraph2referto?A．Exercise.　　　　　B．Development.C．Benefit.D．Study.4．Whatistheauthor'sa

8、ttitudetowardstheanimalstudy?A．Negative.B．Objective.C．