2019版高考英语 Unit 18 Beauty夯练（含解析）北师大版选修6

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1、Unit18Beauty一、阅读理解。Canexerciseduringchildhoodprotectyouagainstmemorylossmanydecadeslater?Exerciseearlyinlifeseemstohavelifelongbenefitsforthebrain，inratsatleast.“Thisisananimalstudy，butitshowsthatphysicalactivityatayoungageisveryimportant—notjustforphysicaldevelo

2、pment，butforthewholelifelongtrackofcognitive(认知的)developmentduringageing，”saysMartinWojtowiczoftheUniversityofToronto，Canada.“Inhumans，itmaydelaytheappearanceofAlzheimer'sdisease(阿尔茨海默病)，possiblytothepointofpreventingit.”Wojtowicz'steamdivided80youngmaleratsintot

3、woequalgroups，andplacedrunningwheelsinthecagesofonegroupforaperiodofsixweeks.Aroundfourmonthslater—whentheratshadreachedmiddleage—theteamtaughtalltheratstoconnectanelectricshockwithbeinginaspecificbox.Whenplacedinthebox，theyfrozewithfear.Twoweekslater，theteamtest

4、edtheratsinthreesituations：exactlythesameboxinthesameroom，thesameboxwiththeroomarrangeddifferently，andapletelydifferentboxinadifferentroom.Theratswithoutaccesstoarunningwheelwhentheywereyoungnowfrozethesamepercentageoftimesineachofthesesituations，suggestingtheyco

5、uldn'trememberwhichonewasdangerous.Butthosethathadbeenabletorunintheiryouthfroze40to50percentlessinbothchangedboxsettings.“Theresultssuggesttheamountofphysicalactivitywhenwe'reyoung，atleastforrats，hasinfluenceonthebrainandcognitivehealth—intheformofbettermemories

6、—whenwe'reolder，”saysArthurKramerofNortheasternUniversityinBoston，whohasfoundthat，inhumans，exercisepromotesthegrowthofnewbraincells.1．Thestudyshowsthat________.A．physicalactivityisimportantforphysicalhealthB．usingtherunningwheelsisofbenefittotherats'growthC．physi

7、calactivitycanpreventhumans'Alzheimer'sdiseaseD．themoreexercisearathaswhenyoung，thebettermemoryitwillpossesswhenolder2．HowareParagraph3and4mainlydeveloped?A．Byanalyzingcauses.B．Bygivinganexample.C．Bydescribingtheprocess.D．Byshowingdifferences.3．Whatdoestheunderli

8、nedword“it”inParagraph2referto?A．Exercise.　　　　　B．Development.C．Benefit.D．Study.4．Whatistheauthor'sattitudetowardstheanimalstudy?A．Negative.B．Objective.C．Critic