短文听力训练答案

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1、短文听力训练Passage11.A2.B3.DUnlessyouhavevisitedthesouthernUnitedStates,youprobablyhaveneverheardofKudzu.Kudzu,asanyfarmerinthesouthwillsadlytellyou,isasuper-poweredweed.Itisastrongclimbingplant.Onceitgetsstarted,Kudzuisalmostimpossibletostop.Itclimbstothetopsofthetallesttr

2、ees.Itcancoverlargebuildings.Wholebarnsandfarmhouseshavebeenknowntodisappearfromview.Whereveritgrows,itsthicktwistingstemsareextremelyhardtoremove.Kudzuwasoncethoughttobeahelpfulplant.OriginallyfoundinAsia,itwasbroughttoAmericatohelpprotectthelandfrombeingswallowedbyth

3、esea.Itwasplantedwhereitstoughrootswhichgrowuptofivelongcouldhelpholdbackthesoil.Buttheplantsoonspreadtoplaceswhereitwasn’twanted.Farmersnowhavetofighttokeepitfromkillingotherplants.Inaway,Kudzuisasignoflaborshortageinthesouth.Wherethereisnoonetoworkthefields,Kudzusoon

4、takesover.ThenorthernUnitedStatesfacesnothreatfromKudzu.Harshwinterskillitoff.Theplantlovesthewarmthofthesouth,butthesouthsurelydoesn’tloveit.IfsomeonecouldinventsomeuseforKudzuandremoveitfromsouthernfarmland,hisorherfortunewouldbeassured.Questions:1.Whatdowelearnabout

5、“Kudzu”fromthepassage?2.WhatwillhappenifthefieldsareneglectedinthesouthernUnitedStates?3.Whyisn’tKudzuathreattothenorthernUnitedStates?Passage21.C2.B3.DReducingtheamountofsleepstudentsgetatnighthasadirectimpactontheirperformanceatschoolduringtheday.Accordingtoclassroom

6、teachers,elementaryandmiddleschoolstudentswhostayuplateexhibitmorelearningandattentionproblems.ThishasbeenshownbyBrownMedicalSchoolandBradleyHospitalresearch.Inthestudy,teacherswerenottoldtheamountofsleepstudentsreceivedwhencompletingweeklyperformancereports,yettheyrat

7、edthestudentswhohadreceivedeighthoursorlessashavingthemosttroublerecallingallthematerial,learningnewlessonsandcompletinghigh-qualitywork.Teachersalsoreportedthatthesestudentshadmoredifficultypayingattention.Theexperimentisthefirsttoaskteacherstoreportontheeffectsofslee

8、pdeficiencyinchildren.Juststayinguplatecancauseincreasedacademicdifficultyandattentionproblemsforotherwisehealthy,wel