题目内容：
听录音，回答题 Imagineaclassroommissingtheonethingthathaslongbeen1anecessaryparttoreadingandwriting:paper.Nonotebooks,notextbooks,notestpaper.Andtherearenopencilsorpens,which,afterall,alwaysseemto2inkatthecriticalmoment.
A"paperlessclassroom"iswhatmoreandmoreschoolsaretryingtoachieve.
Studentsdon'tdoany3inthisclass.Instead,theyusepalm-sized,orspecially-designedcomputers.TheteacherdownloadstextsfromInternetlibrariesandsendsthemtoeverystudent's4computer.HavingcomputersalsomeansthatstudentscansearchtheWeb.Theycanlookupinformationonany5they'restudying,
frommathtosocialscience.
Andexamscangoonline,too.AtaschoolinTennessee,U.S.A.,studentstaketestsontheirowncomputers.Theteacher6thegradesonthenetworkforeveryonetoseeandthencopiesthemintohisorherown7gradebook.Apaperlessclassroomisabigsteptowards8thewasteofpaper.Aschoolteachersaidsheusedtogiveabout900piecesofpapereachweektothestudents."Thinkaboutthemoneyandtreeswecouldsavewiththecomputers,"shesaid.But,withallthistechnology,there'salwaystheriskthatthemachineswill9.So,incaseofapowerfailureortechnicalproblem,papertextbooksarestillwidely10forthesehi-techstudents.
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