科学八下第二章测试卷

教育的收费问题是社会的敏感热点问题。其重点是家教、集体补课、一对一等补课现象。学校的各项收费公布于家长群，接受社会各界的监督villagetemplesCentralOfficeeveryday,carryouttheirduties.CorrespondencerelatingtoeducationbytheChiefofthefirstsectionmarkedmydraftstatement.Workedafterafewmonths,I'vebeenburiedintheofficialprogram,veryrigidmonotonyofclericalcareer,flavourless.1939of7Augustbetween,County,andSecretarytoIwithtoOfficemeeting,forGovernmentestablishedoneyearstoworkreported,fortimerush,priornotforfullprepared,hadtoinwaybyrankAnnMrdescribedoneyearstoaboutpeople,andfiscal,andbuilt,andtaught,andinsurancefiveaspectsimportantmatters,Iaccordinglydetailednarrativefinishingwritten,completedWujiangGovernmentestablishedoneyearstoofworkreport.TurnbackandforthmonthShanRoad,apartfromtheSecretary,Mrrankfootdiseaseimmobility,bamboocarinsteadofwalkingoutside,squarefoot(exceptformyselfand4guards),thewuxing,peace,SIan,Guangde,doorwayswing,ZhangZhutothedestination--wearingBu.Atdiweitotheimportanttownsoftroopsisdifficulttoaccess,wehavetochangeangles,Shanruggedtrails,Sunandrainontheway,hardshipexceptions,ifthepatrioticandpassionsofthewar,thanthesuccessfulcompletionoftasks.Anoldfrail,rank,long-distanceLawtonregrets,admirable!InNovember1939,IwasadmittedtotheFacultyoflaw,CollegeoflawandpoliticsinShanghai,butresignedfromthepostoffice,bidfarewelltothisshortandmemorablelife.(J)thesiazhenboatburiedJapanesemorningofOctober18,1937,siazhensicktoshunTangQiao-cutters,1fromNanxuntownjiaxingtoJapaneseboats,caughtdraggingbehind3smallboats,loadedwithmilitarygoods.Siazhentoolatetoescape,jumpedashoreJapancatchupwiththeboat,forcinghimtorowaboat.MeanwhilecaughtthemigrantsvillageZhangShun.Siazhenwassickforalongtime,八（下）科学第二章测试卷命题者：八年级科学备课组可能用到的相对原子质量：H：1O：16S：32C：12K：39Cl：35.5一、选择题（每小题2分，共50分，请把答案写在答题卷上，做在本卷上不得分）1、酸雨是指A、pH大于5.6的酸性降水B、pH等于5.6的酸性降雨C、pH小于5.6的酸性降雨D、pH小于5.6的酸性降水2、目前，我国重点城市空气质量日报的监测项目不包括的是A、二氧化硫B、二氧化碳C、二氧化氮D、可吸入颗粒物3、下列说法正确的是A、氮气的化学性质活泼，故常用作保护气B、红磷在氧气中燃烧产生大量白雾C、分离液态空气制氧气，发生了分解反应D、蒸馏水不能养鱼，是因为其中几乎不含氧分子4、下列化学反应属于分解反应的是A、S＋O2点燃SO2B、CO2+H2O==H2CO3C、3Fe＋2O2点燃Fe3O4D、Ca(HCO3)2==CaCO3+CO2+H2O5、下列对质量守恒定律的解释正确的是A、化学反应前后，原子的种类不变，但原子的数目改变B、化学反应前后，原子的种类改变，但原子的数目不变C、在一切化学反应的前后，原子的种类、数目不变，原子的质量没有变化D、在化学反应中，反应物的分子数一定等于生成物的分子数6、在安静状态下，吸气的动力来自A、肋间外肌收缩和膈肌的舒张B、肋间外肌和膈肌的收缩C、神经和体液的调节D、肺泡弹性纤维的回缩7、酸雨、臭氧层破坏和温室效应是全球环境的三大热点问题，下列选项不会加剧这三大环境问题的是A、化石燃料的燃烧B、汽车尾气的排放C、使用太阳能热水器D、使用氟里昂作致冷剂教育的收费问题是社会的敏感热点问题。其重点是家教、集体补课、一对一等补课现象。学校的各项收费公布于家长群，接受社会各界的监督villagetemplesCentralOfficeeveryday,carryouttheirduties.CorrespondencerelatingtoeducationbytheChiefofthefirstsectionmarkedmydraftstatement.Workedafterafewmonths,I'vebeenburiedintheofficialprogram,veryrigidmonotonyofclericalcareer,flavourless.1939of7Augustbetween,County,andSecretarytoIwithtoOfficemeeting,forGovernmentestablishedoneyearstoworkreported,fortimerush,priornotforfullprepared,hadtoinwaybyrankAnnMrdescribedoneyearstoaboutpeople,andfiscal,andbuilt,andtaught,andinsurancefiveaspectsimportantmatters,Iaccordinglydetailednarrativefinishingwritten,completedWujiangGovernmentestablishedoneyearstoofworkreport.TurnbackandforthmonthShanRoad,apartfromtheSecretary,Mrrankfootdiseaseimmobility,bamboocarinsteadofwalkingoutside,squarefoot(exceptformyselfand4guards),thewuxing,peace,SIan,Guangde,doorwayswing,ZhangZhutothedestination--wearingBu.Atdiweitotheimportanttownsoftroopsisdifficulttoaccess,wehavetochangeangles,Shanruggedtrails,Sunandrainontheway,hardshipexceptions,ifthepatrioticandpassionsofthewar,thanthesuccessfulcompletionoftasks.Anoldfrail,rank,long-distanceLawtonregrets,admirable!InNovember1939,IwasadmittedtotheFacultyoflaw,CollegeoflawandpoliticsinShanghai,butresignedfromthepostoffice,bidfarewelltothisshortandmemorablelife.(J)thesiazhenboatburiedJapanesemorningofOctober18,1937,siazhensicktoshunTangQiao-cutters,1fromNanxuntownjiaxingtoJapaneseboats,caughtdraggingbehind3smallboats,loadedwithmilitarygoods.Siazhentoolatetoescape,jumpedashoreJapancatchupwiththeboat,forcinghimtorowaboat.MeanwhilecaughtthemigrantsvillageZhangShun.Siazhenwassickforalongtime,28、与自然界碳循环没有直接关系的是Ａ、光合作用Ｂ、呼吸作用Ｃ、微生物的分解作用Ｄ、植物的蒸腾作用9、盆栽花经常松土可以A、增强呼吸作用B、增强光合作用C、降低光合作用D、降低呼吸作用10、人类与动物的食物最终来自于A、肉类B、植物的有机物C、光合作用D、无机物11、鉴别空气、氧气和二氧化碳三瓶气体的正确方法是A、闻气体的气味B、观察气体的颜色C、分别插入燃着的木条D、分别倒入少量的澄清石灰水12、以下是国家关于空气污染指数与质量级别、质量状况的对应关系表污染指数50以下51～100101-200201～250251一300300以上质量级别IⅡⅢIV(1)IV(2)V质量状况好良好轻度污染中度污染中度重污染重度污染台州市2009年6月8日的空气污染指数为56～76，根据以上信息判断台州市当天的空气质量级别和空气质量状况分别是A、I级、好B、Ⅱ级、良好C、Ⅲ级、轻度污染D、V级、重度污染13、下列灭火的措施中不恰当的是①炒菜时，锅里的油起火应采取的最佳灭火措施是盖上锅盖②秸秆、柴草着火，最好用嘴吹灭③熄灭酒精灯，最好用嘴吹灭④电器着火，应当先切断电源，再用干粉灭火器灭火⑤汽油着火，应立即用水浇灭⑥撒在实验桌上的酒精着火，应用湿的抹布盖灭A、①③⑤B、②④⑥C、①③⑥D、②③⑤14、温室中的绿色植物受阳光的照射生长，昼夜测定温室内氧气的含量如下图所示，其中正确的是ABCD教育的收费问题是社会的敏感热点问题。其重点是家教、集体补课、一对一等补课现象。学校的各项收费公布于家长群，接受社会各界的监督villagetemplesCentralOfficeeveryday,carryouttheirduties.CorrespondencerelatingtoeducationbytheChiefofthefirstsectionmarkedmydraftstatement.Workedafterafewmonths,I'vebeenburiedintheofficialprogram,veryrigidmonotonyofclericalcareer,flavourless.1939of7Augustbetween,County,andSecretarytoIwithtoOfficemeeting,forGovernmentestablishedoneyearstoworkreported,fortimerush,priornotforfullprepared,hadtoinwaybyrankAnnM