学必求其心得，业必贵于专精
学必求其心得，业必贵于专精
学必求其心得，业必贵于专精
兵团二中高二年级第二学期第四次月考英语试卷
I。阅读理解(共15小题,每小题2分，满分30分）
A
WinterbeginsinthenorthonDecember22nd。Peopleandanimalshavebeendoingwhattheyalwaysdotoprepareforthecoldermonths.Squirrels（松鼠)，forexample，havebeenbusygatheringnutsfromtrees。Well，scientistshavebeenbusygatheringinformationaboutwhatthesquirrelsdowiththefoodtheycollect。
TheyexamineddifferencesbetweenredsquirrelsandgraysquirrelsintheAmericanstateofIndiana.Thescientistswantedtoknowhowthesedifferencescouldaffectthegrowthofblackwalnut(黑胡桃)trees。Theblackwalnutisthenutofchoiceforbothkindsofsquirrels。Theblackwalnuttreeisalsoacentralpartofsomehardwoodforests。
RobSwihartofPurdueUniversitydidthestudywithJakeGoheen,aformerPurduestudentnowattheUniversityofNewMexico.Thetworesearchersestimatethatseveraltimesasmanywalnutsgrowwhengatheredbygraysquirrelsascomparedtoredsquirrels。Graysquirrelsandredsquirrelsdonotstorenutsandseedsinthesameway。Graysquirrelsburynutsoneatatimeinanumberofplaces.Buttheyseldomrememberwheretheyburiedeverynut.Sosomenutsremainintheground.Conditionsarerightforthemtodevelopandgrowthefollowingspring。Redsquirrels，however,storelargegroupsofnutsaboveground.ProfessorSwihartcalls“deathtrapsforseeds”.
GraysquirrelsarenativetoIndiana。ButProfessorSwihartsaystheirnumbersbegantodecreaseasmoreforestswerecutforagriculture.Redsquirrelsbegantospreadthroughthestateduringthepastcentury。
Theresearcherssayredsquirrelsarenativetoforeststhatstaygreenallyear，unlikewalnuttrees。TheysaythecleaningofforestlandforagriculturehashelpedredsquirrelsinvadeIndiana.JakeGoheencallsthemasignofanenvironmentalproblemmorethanacause。
1.ThestudydonebyRobSwihartandJakeGoheenisto________.
A.findouttheliv