winter begins in the north on december 22nd. people 阅读理解答案

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1、WinterbeginsinthenorthonDecember22nd.People阅读理解答案　　阅读理解WinterbeginsinthenorthonDecember22nd.Peopleandanimalshavebeendoingwhattheyalwaysdotoprepareforthecoldmonths.Squirrels,forexample,havebeenbusygatheringnutsfromtrees.Well,scientistshavebeenbusygatheringinformati

2、onaboutwhatthesquirrelsdowiththefoodtheycollect.　　TheyexamineddifferencesbetweenredsquirrelsandgraysquirrelsintheAmericanstateofIndiana.Thescientistswantedtoknowhowthesedifferencescouldaffectthegrowthofblackwalnuttrees.Theblackwalnutisthenutofchoiceforbothkindsofs

3、quirrels.Theblackwalnuttreeisalsoacentralpartofsomehardwoodforests.　　RobSwihartofPurdueUniversitydidthestudywithJakeGoheen,aformerPurduestudentnowattheUniversityofNewMexico.Thetworesearchersestimatethatseveraltimesasmanywalnutsgrowwhengatheredbygraysquirrelsascomp

4、aredtoredsquirrels.Graysquirrelsandredsquirrelsdonotstorenutsandseedsinthesameway.Gray　　　　squirrelsburynutsoneatatimeinanumberofplaces.Buttheyseldomrememberwheretheyburiedeverynut.Sosomenutsremainintheground.Conditionsarerightforthemtodevelopandgrowinthefollowings

5、pring.Redsquirrels,however,storelargegroupsofnutsaboveground.ProfessorSwihartcalls“deathtrapsforseeds”.　　GraysquirrelsarenativetoIndiana.ButProfessorSwihartsaystheirnumbersbegantodecreaseasmoreforestswerecutforagriculture.Redsquirrelsbegantospreadthroughthestatedu

6、ringthepastcentury.　　Theresearcherssayredsquirrelsarenativetoforeststhatstaygreenallyear,unlikewalnuttrees.TheysaythecleaningofforestlandforagriculturehashelpedredsquirrelsinvadeIndiana.JakeGoheencallsthemasignofanenvironmentalproblemmorethanacause.　　25.Thestudydo

7、nebyRobSwihartandJakeGoheenisto________.　　A.findoutthelivingconditionsforsquirrels　　B.dosomethingtogetridofsquirrels　　C.save　　　　theforestsintheAmericanstateofIndiana　　D.learnsquirrels’influenceonblackwalnuttrees　　26.Thedifferencebetweengraysquirrelsandredsquirrels

8、mainlyliesin________.　　A.thewaytheystorethewalnuts　　B.thewaytheygatherthewalnut　　C.thenumberofthenutstheycancollect　　D.thefactthatthegraysquirrelshaveab