手机的坏处作文400

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Aseverybodyknows,mobilephonesisplayinginourdailylifenowadays.Buttheimportantpartofit,theyhaveBOTadva

Mobilephonehasalotofmerits.Firstofall,itismuchmoreconvenientthanregularphone.Youcanmakeaphonecallwhe

Asweknow,withthedevelopmentofsociety,moreandmorestudentsarehavingcellphone.Theyaregivenaspresentsfro

Aseverybodyknows,mobilephonesisplayinginourdailylifenowadays.Buttheimportantpartofit,theyhaveBOTadva

从化学角度介绍一下吸烟过程中产生有害成分的结构、性质及危害.香烟中有2540多种成分,燃烧后发生复杂的物理化学变化,产生的烟气中有400多种致癌物质,还有10多种会促进癌发展的物质,其中对人体危害最大

(1),influencetherest.Chatmessages,delayacademic;Badinformation,pollutionsoul;(2),comparethewind.Beca

Asweknow,withthedevelopmentofsociety,moreandmorestudentsarehavingcellphone.Theyaregivenaspresentsfro

▲visionharm:theuseofcomputer,theeyesthemostvulnerable,especiallyeasytocausethejuvenilemyopiaandcilia

AdvantagesandDisadvatagesofMobilephonesAseverybodyknows,mobilesareplayingaimportantpartinourdailylif

AdvantagesanddisadvantagesofmobilephoneMobilephoneisnowimportantcommunicationtool,andweareinseparabl

要点：有辐射,影响健康由于自制力不强,耽误学习从这两点展开就可以了

Nowadays,withtherapiddevelopmentofITandinformationindustry,cellphonesplayadominantroleintownspeople'

Asweknow,withthedevelopmentofsociety,moreandmorestudentsarehavingcellphone.Theyaregivenaspresentsfro

Somestudentsliketotaketheircellphonetoschool.Itbreaktheschoolrules.It'snotrighttodosobecausethereare

Asweknow,withthedevelopmentofsociety,moreandmorestudentsarehavingcellphone.Theyaregivenaspresentsfro

读书的坏处:黄书,盗版书对儿童都不利,所以读书不好.2:开卷是否有益,主要还是看谁看书,看什么书和年龄这些因素.如果是一个心术不正的人看书,不管看什么书,他吸收的总是不好的语言和思想.相反,是一个素质

Cellphoneisverypopularinourlife.Itisausefultoolforustocommunicatewithotherswhereverheorsheis.Wecanal

其实最为影响小学生上网的就是网络游戏.一、有些小学生玩了一些游戏,他的脑子里就想那个游戏的内容,完全不顾学习二、更有一部分的小学生因为一些不良的信息,而导致偷东西、去网吧玩完了钱就在家里偷、产生暴力现

ofusingcellphone.Herearemyreasons.First,cellphonewilldistractusfromlisteningtotheteachersinclass.For