英语完形填空（求解释选择或像老师一样讲解原文）5Bigschoolbagshavebeenaseriousproblemforstudentsforalongtime.Maybeyourschoolbagistoo41tocarry,andittroublesyoualot42youwanttofindabookouttore

　　英语完形填空（求解释选择或像老师一样讲解原文）

　　5Bigschoolbagshavebeenaseriousproblemforstudentsforalongtime.Maybeyourschoolbagistoo41tocarry,andittroublesyoualot42youwanttofindabookouttoread,Nowane-textbookwill43you.Itissaidthate-textbooksaregoingtobe44inChinesemiddleschools.Ane-textbook,infact,isasmall45forstudents.Itismuch46thanausualschoolbagandeasytocarry.Thoughitisassmallasabook,itcan47allthematerials(材料)forstudy.Thestudentscanreadthetextpagebypageonthe48,takenoteswiththepointer(屏写笔).Oreven"49"theirhomeworktotheirteachersbysendinge-mails.Alltheyhavetodoistopressabutton.Somepeoplesaye-textbooksaregood.butsomesaytheymaybe50forthestudents'eyes.Whatdoyouthinkofit?

　　()41.A.lightB.heavyC.usefulD.comfortable　

　　　()42.A.tillB.afterC.beforeD.when　

　　　()43.A.troubleB.preventC.helpD.understand　

　　　()44.A.usedB.keptC.inventedD.lent　

　　　()45.A.TVB.radioC.penD.computer

　　()46.A.heavierB.lighterC.cheaperD.brighter

　　()47.A.holdB.buildC.discoverD.practise

　　()48.A.blackboardB.deskC.screenD.card

　　()49.A.findoutB.handinC.getbackD.giveback　

　　　()50.A.helpfulB.famousC.goodD.Bad