Whatdoyouthinkofdifferentkindsofreferencebooks（参考书）？Wedidasurvey．Here'resomeoftheiranswers．WangQianReferencebookshavesomedisadvantages．Somereferencebooksshowanswerstotheexercisesintextbooks．Thisisn't

　　Whatdoyouthinkofdifferentkindsofreferencebooks（参考书）？Wedidasurvey．Here'resomeoftheiranswers．

　　WangQian

　　Referencebookshavesomedisadvantages．Somereferencebooksshowanswerstotheexercisesintextbooks．Thisisn'tverygood．Studentswilljustcopytheanswersdirectlyinsteadofthinkingforthemselves．Dayafterday，studentswon'tlistencarefullyinclass．

　　ZhengXia

　　Sometimes，referencebooksareuseful．Somereferencebooksshowsomethingalittlebitmoredifficultthanthetextbooks．Theychallengeusandletusreachahigherlevelinourstudies．Soifyouwanttolearnmore，referencebooksareneeded．

　　LiuWei

　　Idon'tthinkreferencebooksareveryhelpful．Ifwelistentoourteacherscarefullyandsolvetheproblemsatschool，thisisenoughtograsp（掌握）alltheknowledge．Besides，theschoolhasalreadygivesusalotofhomework．Morereferencebookswillonlymakeussickofstudying．AndforsomesubjectslikeEnglish，ifyouwanttolearnwell，thebestwayistospeak，notjusttodoexercises．

　　Foryour referencebooks（81）___LiuYangInsomeways，theyareusefulbecausethey（82）___ better．ZhengXiaReferencebookscanhelpuslearnmoreandchallengeusto（83）___ inourstudies．DisadvantagesWangQianStudentswon'tthinkor（84）___ inclassbecausetheycancopytheanswersfromthereferencebooks．LiuWeiMorereferencebooksaren'tveryhelpful．Theywillonly（85）___