Unit3ComputersⅠ.阅读理解A(2018·吉林长春检测)Electronicbookshavechangedthewaymanypeoplereadforpleasure.Nowonlinetextbooksarechangingthewaysomestudentslearnandsometeachersteach.Morethanonehundredandseventy-fivethousandstudentsattendthepublicschoolsinFairfaxCounty,Virginia,outsideWashington.Lastyear,theschoolsystemuseddigital(数字的)booksinfifteenschools.Thisschoolyear,middleschoolsandhighschoolschangedfromprintedtoelectronictextbooksintheirsocialstudiesclasses.LukeRosaisahistoryteacheratFallsChurchHighSchool.Hisstudentsworkonlaptopcomputersatschool.Heexplainstheideatothemthisway,“Imean,it’sjustlikearegulartextbook,exceptit’sgotitall,online.”PeterNoonan,anassistantsuperintendent(助理监督)ofschools,said,“Theworld’schanging.Andtheonlinetextbookscanchangerightalongwiththeeventsthatarehappening.”Digitalbooksalsocostlessthanprintedtextbooks,hesaid.AstudentnamedMelanieReutersaid,“Idon’thavetocarryatextbookaround,sothat’snice.”Butanotherstudentsaid,“Idon’tlikeitbecausetheInternetsometimesdoesn’twork.”StudentsalsoneedaccesstotheInternetwhentheyarenotatschool.AbouttenpercentofstudentsinFairfaxCountydonothaveacomputeroronlineaccessathome.PubliclibrariesinthecountyhavefreeInternet.Therearealsoafter-schoolcomputerlabsaswellascomputerclubhousessupportedbythecounty.MiddleschoolstudentSliemanHakimishappyaboutthat.Hesaid,“Myfamilyonlyhasonecomputer;mysisterandIbothdoourhomeworkonit.SoIcomeheretodomyhomework.It’sgood.”Otherschoolsystemsintheareaarealsoconsideringonlinetextbooks.1.WhichofthefollowingisNOTusedwhenstudentshavesocialstudiesclasses?A.Computers.B.TheInternet.C.Papertextbooks.D.Electronictextbooks.2.Oneofthedisadvantagesofdigitaltextbooksisthat.A.they’remoreexpensiveB.theycan’tbeusedifthecomputerisofflineC.they’resoonoutofdateD.readingonlinedoesharmtostudents’eyes3.WhydoesSliemanHakimfeelhappy?A.Heisofferedafreecomputertodohishomework.B.Hedoesn’thavetodohishomeworkathome.C.HehasaccesstotheInternettostudyatanyplace.D.Heneedn’tshareacomputerwithhissistertodohomework.4.Whatcanwelearnfromthepassage?A.Allstudentslikedigitaltextbooksbecausetheyarenew.B.Digitaltextbooksaremorebeautifulthanpapertextbooks.C.Studentscandotheirhomeworkinthecomputerclubhouses.D.Thelessonsonlinearecompletelydifferentfromthoseinpapertextbooks.导学号〚23280038〛B(2018·陕西西安中学期中检测)TheInternetplaysabigpartinhumanlife.Weuseitforworkandentertainment.WecanfindnewrecipesontheInternetoradviceonstayinghealthy.Wecanevenuseittolearnanewlanguage.WeusetheInternettokeepincontactwithfamilyandfriendsandstayintouchwithissueswecareabout.Thelistgoesonandon.So,theremaybenogoingbacktoanInternet-freelife.ButcanusingtheInternettoomuchbebadforourhealth?Itmightbe,sayresearchers.AnewstudyfindsthatheavyInternetusemaybeconnectedtohighbloodpressureinanunlikelygroup—teenagers.So,trytobearesponsibleguardian(监护人).Thestudyresultsshowthatteenswhospendatleast14hoursaweekonlineweremorelikelytohavehighbloodpressure.Highbloodpressuremakesyourheartandbloodvesselsworktoohard.Overtime,thisextrastrainincreasesyourriskofaheartattackorstroke.Highbloodpressurecanalsocauseheartandkidneydisease.Itisalsocloselylinkedtosomeformofdementia(痴呆),orabraindisease.TheHenryFordHospitalinDetroit,Michigandidthestudy.Itinvolved335youngpeople,from14to17yearsold.Onehundredandthirty-fouroftheteensweredescribedas“heavyInternetuser...
