Acomputerisan"informationprocessor".Itisgiveninformationcalled"data"instructedtodocertainthingsandthenshowustheresults.Thedataputintothecomputeriscalledthe"input"andtheresults

　　Acomputerisan"informationprocessor".Itisgiveninformationcalled"data"instructedtodocertainthingsandthenshowustheresults.Thedataputintothecomputeriscalledthe"input"andtheresultswhichcomeoutarethe"output".SomepeoplesaythecircleoflargestandingstonesatStonehengeisakindofcomputer.Prehistorypeopleworkedouttheircalendarfromthepositionoftheshadowsmadebythesunshiningonthestones.

　　Extract2

　　Teachyourselfnewsubjectsandskillsatyourownpacewithahomecomputer.Useittohelpwithschoolworkforself-improvementeventoimproveyourcareerskills.Learntouchtyping.

　　Foreignlanguagesorcomputerprogramming.Ahomecomputercanhelpchildrenofallageslearnclassroomsubjectssuchasspellinggeographyandothers.Infactitmakeslearningfun.Soifyouwanttoteachyourselforhelpyourchildrenteachthemselves---getahomecomputer.Itcanalsohelpyoumanageyourpersonalfinances(经济）orhelpyoutoworktaxesandplanhouseholdbudgets(预算）.Youcanmakebusinessapleasurewithahomecomputer

　　1.Thewriterintroducesthewordssuchas"input"and"output"inorderto_____

　　A.introducepeopletocomputerlanguage

　　B.showcomputerlanguageisthesameasEnglish

　　C.helppeoplesomescientificlanguage

　　D.givepeoplesomescientificlanguage

　　2.WhydoesthewritertalkaboutStonehengeinExtract1?

　　A.Togiveanexampleoftheveryfirstcomputer

　　B.Toshowthatcomputersareolderthanmankind

　　C.Totellthedifferencebetweenthepastandthepresent

　　D.Togiveanotherwayofexplainingcomputers

　　3.Ifyouthinkofthecircleoflargestandingstonesasacomputer_____

　　A.theshadowistheinputandthepositionistheoutput

　　B.thesunlightistheinputandthecalendaristheoutput

　　C.thepositionistheinputandthesunlightistheoutput

　　D.thecalendaristheinputandtheshadowistheoutput

　　4.Extract2isprobablytakenfrom_____

　　A.acomputertextbook

　　B.acompany'sadvertisement

　　C.ateach-yourselfcomputerbook

　　D.achildren'