高考英语(人教)一轮预热自练巩固题必修4U4及答案.docx

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1、2019高考英语（人教）一轮预热自练巩固题必修4U4及答案***阅读理解。阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。(2019·春市质量监测一长)Canexerciseduringchildhoodprotectyouagainstmemorylossmanydecadeslater?Exerciseearlyinlifeseemstohavelifelongbenefitsforthebrain，inratsatleast.“Thisisananimalstudy，butitshowsthatphysicalactivityat

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

3、eamdivided80youngmaleratsintotwoequalgroups，andplacedrunningwheelsinthecagesofonegroupforaperiodofsixweeks.Aroundfourmonthslater—whentheratshadreachedmiddleage—theteamtaughtalltheratstoconnectanelectricshockwithbeinginaspecificbox.Whenplacedinthebox，theyfrozewithfear.Twoweekslater，

4、theteamtestedtheratsinthreesituations：exactlythesameboxinthesameroom，thesameboxwiththeroomarrangeddifferently，andacompletelydifferentboxinadifferentroom.Theratswithoutaccesstoarunningwheelwhentheywereyoungnowfrozethesamepercentageoftimesineachofthesesituations，suggestingtheycouldn'

5、trememberwhichonewasdangerous.Butthosethathadbeenabletorunintheiryouthfroze40to50percentlessinbothchangedboxsettings.“Theresultssuggesttheamountofphysicalactivitywhenwe'reyoung，atleastforrats，hasinfluenceonthebrainandcognitivehealth—intheformofbettermemories—whenwe'reolder，”saysArt

6、hurKramerofNortheasternUniversityinBoston，whohasfoundthat，inhumans，exercisepromotesthegrowthofnewbraincells.1．Thestudyshowsthat________.A．physicalactivityisimportantforphysicalhealth第1页B．usingtherunningwheelsisofbenefittotherats'growthC．physicalactivitycanpreventhumans'Alzheimer'sd

7、iseaseD．themoreexercisearathaswhenyoung，thebettermemoryitwillpossesswhenolder2．HowareParagraph3and4mainlydeveloped?A．Byanalyzingcauses.B．Bygivinganexample.C．Bydescribingtheprocess.D．Byshowingdifferences.3．Whatdoestheunderlinedword“it”inParagraph2referto?A．Exercise.B．Development.C．B

8、enefit.D．Study.4．Whatisthe