byLawrenceWenshutonisË|xHSKBPDy501791zv*:+:!:+:!>ISBN-13:978-0-15-350179-1ISBN-10:0-15-350179-0GRADE4Lesson8WORDCOUNT946GENREExpositoryNonfictionLEVELELLHarcourtLeveledReadersOnlineDatabaseCover,©GabePalmer/Alamy;p.3,©altrendoimages/GETTYIMAGES;p.4,©LorenSantow/Stone/GETTYIMAGES;p.5,©LeslieGarlandPictureLibrary/Alamy;p.6,p.7,©PhotoDisc/PunchStock;p.8,©TetraImages/Alamy;p.9,©PhotofusionPictureLibrary/Alamy;p.10,©JohnLee/Masterfile;p.11,(l)©mcximages/Alamy,(r)©PabloPaul/Alamy;p.12,©GlowImages/Alamy;p.13,©CharlesGullung/zefa/Corbis;p.14,©Scientifica/VisualsUnlimited.Copyright©byHarcourt,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedortransmittedinanyformorbyanymeans,electronicormechanical,includingphotocopy,recording,oranyinformationstorageandretrievalsystem,withoutpermissioninwritingfromthepublisher.RequestsforpermissiontomakecopiesofanypartoftheworkshouldbeaddressedtoSchoolPermissionsandCopyrights,Harcourt,Inc.,6277SeaHarborDrive,Orlando,Florida32887-6777.Fax:407-345-2418.HARCOURTandtheHarcourtLogoaretrademarksofHarcourt,Inc.,registeredintheUnitedStatesofAmericaand/orotherjurisdictions.PrintedinChinaISBN10:0-15-350179-0ISBN13:978-0-15-350179-1OrderingOptionsISBN10:0-15-349939-7(Grade4ELLCollection)ISBN13:978-0-15-349939-5(Grade4ELLCollection)ISBN10:0-15-357278-7(packageof5)ISBN13:978-0-15-357278-4(packageof5)Ifyouhavereceivedthesematerialsasexaminationcopiesfreeofcharge,HarcourtSchoolPublishersretainstitletothematerialsandtheymaynotberesold.Resaleofexaminationcopiesisstrictlyprohibitedandisillegal.Possessionofthispublicationinprintformatdoesnotentitleuserstoconvertthispublication,oranyportionofit,intoelectronicformat.1234567891098512111009080706byLawrenceWenshutonisComputersarealmosteverywheretoday.Manypeoplehavecomputersintheirhomes.Therearecomputersinschools.Therearecomputersinlibraries.Therearecomputersinstores.Therearecomputersinoffices.Computersareusedinspecialways,too.Manyfactoriesusecomputers.Thecomputerscontrollargemachines.The...
