《第十二课 没有网址能查到需要的信息吗》教学设计

《第十二课 没有网址能查到需要的信息吗》 四川省义务教育课程改革实验教科书《信息技术》四年级下册 第十二课 没有网址能查到需要的信息吗 【教材】 《没有网址能查到需要的信息吗》是由四川省教育科学研究所编写，四川出版集团、四川教育出版社所共同出版的小学信息技术教材四年级下册第十二课。其主要内容包括:一、搜索引擎和它的基本使用方法 ;二、巧用关键词查找信息;三、查找图片;四、按搜索引擎的分类查找信息;五、按分类和关键词综合查询。本设计为第一课时，时间为40分钟，教学重点放在二、五部分的教学上。 新教材将义务教育的信息技术划分为五个阶段。四年级属于第二阶段，是技能形成的重要阶段。本课被安排在《初步认识互联网》，《浏览网页》，《收藏网站信息》之后，《网页信息保存和使用》以及《利用网络制作你的旅游行程路线图》之前，是网络应用能力的进一步培养，也为后面教学奠定了基础。 【教学方法】 通过第九课《初识互联网》、第十课《巧用浏览器》以及第十一课《收藏自己喜欢的网站》的学习，学生对上网有了一定的认识和基本的操作能力。所以本课在教学中采用任务驱动、小组协作探究法、讲授式教学法、情境式教学法，让学生大胆进行尝试操作，观察现象，发现规律，并请学生示范，肯定他们的成绩，以鼓励他们自主探索学习，培养解决问题的能力。利用关键词查找信息以及按分类和关键词综合查询是本课的教学重难点。教师在教学时，可根据学生出现的问题或教师创设情境设置问题，让学生思考、探索、尝试、并最终解engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded tank code for construction and acceptance of 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the 决问题，加深印象。 【教学目标】 一、知识与技能目标: 1、了解搜索引擎和它的基本使用方法。 2、掌握巧用关键词查找信息的方法。 3、掌握查找图片的方法，能够按要求查找图片。 4、了解按搜索引擎的分类目录查找信息方法。 5、掌握按分类和关键词综合查询的方法 二、过程与方法目标: 通过探究、演示、小组合作学习、比赛等方式让学生掌握在网络上查询信息的方法并学会运用。 三、情感态度与价值观目标: 1、让学生在完成学习任务的过程中感受本课知识在生活、学习中的价值。 2、通过搜索引擎也能搜索到同学们在网上的发言、评论和文章，所以我们要文明上网。 【教学重点】 利用关键词查找信息;按分类和关键词综合查询。 【教学难点】 能准确设置关键词，结合分类项目综合查询信息。 【教学准备】 1、网络环境下的多媒体广播教学教室。 2、学生学习帮助资料一份，课前通过凌波电子教室发放到每台学生机的桌面。 engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded tank code for construction and acceptance of 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the 【教学过程】 导入: 同学们今天我们先来做一个手工——折纸船，谁会折纸船,请学生上台试一试。学生中有很多甚至全班同学都不会折纸船，这时老师用几十秒的时间用纸折出一只纸船。同学们想不想看着自己亲手折的纸船在小河中顺水而去啊，你们想不想学折纸船啊。 老师告诉你们，网上有很多这方面的学习资料，而且老师也是在网上学会的哦。哪位同学能告诉我，怎样才能找到这些学习资料呢,前面我们已经学会根据网址浏览网站了。但是现在我们不知道教人折纸船的网站啊～如果我们没有网址或者事先不知道在哪个网站能查到我们需要的信息，该怎么办呢,请同学们开始自学书上P70—P73内容。 新课: 一、搜索引擎和它的基本使用方法 任务一: 1、出示自学要求并板书: A、什么是搜索引擎, B、尝试用网页搜索器查找信息。(以折纸船为例) 2、教师巡视辅导。 3、抽生汇报自学情况。 4、小结学习情况并补充不足。 A、介绍概念，搜索引擎——在互联网上，有一些专门为我们查找信息提供服务的网站，我们把它叫做搜索引擎，也叫网页搜索器。并简单介绍几个主要的网页搜索器。 engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded tank code for construction and acceptance of 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the B、教师或学生演示使用网页搜索器——百度查找信息 以折纸船为例: 第一:在IE浏览器地址栏中输入:,进入“百度”网站。 第二、在搜索栏中输入关键词“折纸船”，选择搜索对象为“网页”，然后单击“百度一下”按钮。 单击相关网页的超级链接，即可浏览这些网站。 还没有弄懂的可以看桌面上的《12课学习帮助文档》 任务二: 同样以折纸船为关键词用谷歌查找，看看能找到多少篇与折纸船相关的网页。找到的网页与用百度找到的网页相同么, 小技巧:有时我们用这种搜索引擎无法搜索到想要的信息的时候，我们可以换一种搜索引擎搜索试试。 二、巧用关键词查找信息(板书) 我们找到的相关网页很多，能不能把范围缩小来查找呢,下面我们就来学习巧用关键词查找信息。(小组合作学习) 任务三:(在任务一的基础上进行) 1、在结果中查找(折纸船的) 2、增加关键词(折纸船的教程 视频) 学生小组学习后汇报(通过广播教学方式演示给大家看)。 3、教师小结。 A、提问:用这三种关键词分别进行搜索时，哪个得到的内容范围更窄,这个结果说明什么, engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded tank code for construction and acceptance of 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the B、讨论并小结:关键词的增加，使搜索的范围变小了，但是不能盲目添加关键词。(板书) 任务四: 以“小说”为关键词查找信息; 以“中国小说”为关键词查找信息; 以“中国儿童小说”为关键词查找信息。 提问:用这三个关键词查找信息时，哪个得到的内容范围更窄,这个结果说明什么, 讨论并小结:关键词设置得越准确，搜索的范围越窄，查到的信息也越准确。(板书) 三、查找图片 如果同学们觉得看折纸船教程文字很麻烦，哪我们还可以看折纸船教程图片。介绍演示图片查找方法。 任务五:为“桥”搜索相应图片 四、按搜索引擎的分类目录查找信息(板书) 如果难以确定恰当的关键词，我们还可以采用“分类查找”的办法查找相关信息。比如我们想了解历史上的今天，可以这样查找:(教师示范) 1、在百度的主页单击栏目选项按钮“更多”，就可以得到分类目录。 2、单击常用搜索，--万年历你就可以看到分类目录中的“历史上的今天” 3、选择具体的日期查询后，单击右边上面的历史查询按钮，你就可以知道历史上的某一天都发生了哪些重大事件。 五、按分类和关键词综合查询 任务六:结合两种方法，以九寨沟为例。以景点，交通，住宿、门票价格engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded tank code for construction and acceptance of 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the 等关键词在百度中查询相关信息。(学生操作-小组合作学习，并请两位学生用教师机在大屏幕上示范) 1、进入百度搜索网站(板书) 2、找到常用搜索分类目录(板书) 3、找到社区服务的“百度旅游”并点击进入百度旅游。(板书) 4、找到热门旅游地，便可以了解到重要的景点信息;找到景点路线图可看行走路线查看。 5、找到住宿，则可以了解到相关信息。 6、探究活动P78-79 教师巡回指导。 7、小结 展示学生学习成果。并对学习效果进行评价。 操作实践，巩固方法 1、提出“搜索大比拼”比赛，学生根据要求完成比赛 2、巡视查看完成情况 3、总结比赛情况 总结: 1、请生谈谈自己通过学习掌握了哪些知识，有什么感受。 2、师生一起回顾查寻信息的相关知识。 【教学反思】 一、可取之处: 1、合理的利用教材 本课总共分为包括5个部分。而学校每堂课为40分钟，无法在一堂课中完engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded tank code for construction and acceptance of 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the 成所有教学内容，因此根据在生活中使用的实际情况，我将教材进行了重新整理、组合，在第1课时里，重巧用关键词查找信息，轻分类查找信息;重关键词结合分类综合查找信息，轻单一方法查找信息。 2、给出帮助文档，让学生可以自学，培训学生自主学习的能力。 二、不足之处 由于在前半部分花掉过多时间，使学生在完成任务“搜索大比拼”时的时间不够，没能解决实际问题。 再有就是在教学巡视过程中，发现个别孩子喜欢在“地址栏”中直接输入要查找的信息关键词，也能搜索到需要的信息，这点虽然教材中没有，但作为教师更应好好研究，以便引导学生实际使用。 engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded tank code for construction and acceptance of 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the