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.Itclimbstothetopsofthe

2、tallesttrees.Itcancoverlargebuildings.Wholebarnsandfarmhouseshavebeenknowntodisappearfromview.Whereveritgrows,itsthicktwistingstemsareextremelyhardtoremove.Kudzuwasoncethoughttobeahelpfulplant.OriginallyfoundinAsia,itwasbroughttoAmericatohelpprotectthelandfrom

3、beingswallowedbythesea.Itwasplantedwhereitstoughrootswhichgrowuptofivelongcouldhelpholdbackthesoil.Buttheplantsoonspreadtoplaceswhereitwasn’twanted.Farmersnowhavetofighttokeepitfromkillingotherplants.Inaway,Kudzuisasignoflaborshortageinthesouth.Wherethereisnoo

4、netoworkthefields,Kudzusoontakesover.ThenorthernUnitedStatesfacesnothreatfromKudzu.Harshwinterskillitoff.Theplantlovesthewarmthofthesouth,butthesouthsurelydoesn’tloveit.IfsomeonecouldinventsomeuseforKudzuandremoveitfromsouthernfarmland,hisorherfortunewouldbeas

5、sured.Questions:1.Whatdowelearnabout“Kudzu”fromthepassage?2.WhatwillhappenifthefieldsareneglectedinthesouthernUnitedStates?3.Whyisn’tKudzuathreattothenorthernUnitedStates?Passage21.C2.B3.DReducingtheamountofsleepstudentsgetatnighthasadirectimpactontheirperform

6、anceatschoolduringtheday.Accordingtoclassroomteachers,elementaryandmiddleschoolstudentswhostayuplateexhibitmorelearningandattentionproblems.ThishasbeenshownbyBrownMedicalSchoolandBradleyHospitalresearch.Inthestudy,teacherswerenottoldtheamountofsleepstudentsrec

7、eivedwhencompletingweeklyperformancereports,yettheyratedthestudentswhohadreceivedeighthoursorlessashavingthemosttroublerecallingallthematerial,learningnewlessonsandcompletinghigh-qualitywork.Teachersalsoreportedthatthesestudentshadmoredifficultypayingattention

8、.Theexperimentisthefirsttoaskteacherstoreportontheeffectsofsleepdeficiencyinchildren.Juststayinguplatecancauseincreasedacademicdifficultyandattentionproblemsforotherwisehealthy,wel