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Unit3TimeschangeThegoldenageisbeforeus,notbehindus.—MarkTwain黄金时代在我们面前而不在我们背后。——马克·吐温Thechallengeforourgenerationistocreateaworldwhereeveryonehasasenseofpurpose.—Zuckerberg我们这代人面临的挑战，是创造一个人人都能有使命感的世界。——扎克伯格Comprehensivereformdemandsdedication,courageandpatience.—ReinhardMohn全面改革需要奉献、勇气和耐心。——莱恩哈德·摩恩Everygenerationneedsregeneration.—Spurgeon每一代都需要更新。——斯珀吉翁Itwasthebestoftimes,itwastheworstoftimes；itwastheageofwisdom,itwastheageoffoolishness；itwastheepochofbelief,itwastheepochofincredulity；itwastheseasonoflight,itwastheseasonofdarkness；itwasthespringofhope,itwasthewinterofdespair；wehadeverythingbeforeus,wehadnothingbeforeus；wewereallgoingdirecttoHeaven,wewereallgoingdirecttotheotherway.CanyouimagineaworldwithouttheInternet?It'ssurprisingtothinkaboutit.Now,Chinahasmorethan162millionInternetusers,accordingtotheChinaInternetNetworkInformationCentre.ThisisthesecondlargestnumberofusersintheworldaftertheUnitedStates.Today,66%ofChinesenetizensareteenagers.“Theyspendaboutthirteenhourseveryweekonline，”saidQianHulin，anInternetexpert.DoctorSonginBeijingXuanwuHospitalsaidabout14%ofChinesenetizenswhoareteensoftenlastedovertenhourstoplayonlinegames.ThemainreasonswhyteenagerssurftheNetaretosearchforinformation,tocommunicatewithothersandtohavefun.OntheInternet,teenagerscanfindoutalmostanything.AndsurfingtheNetcanhelpstudentswiththeirhomeworkandwidentheirknowledge.LiDong,ateacheratNo.41MiddleSchoolinShijiazhuang,likesherstudentstousetheInternet.“Whenwetalkinclass,studentswhosurftheNetusuallyknowmorebackgroundinformationthantheothers，”shesaid.Inaddition,peoplecanusetheInternettowritelettersorstories,sendemailsandchat.Manyteenskeepintouchwiththeirfriendsonline.Itischeaperthanphoningsomebodyfarawayandalsomuchquicker.[探索发现]1．Findoutwhichcountryhasthelargestnumberofusersintheworld.TheUnitedStates.2．FindoutwhyteenagerssurftheNet.Theywanttosearchforinformation,tocommunicatewithothersandtohavefun.