“最早”之属

课本第12页在“夏商历法”一目,曾多年沿用商朝“有了世界上最早的日食、月食记录”的说法,这是极不准确的。尽管1999年的课本改为“甲骨文中有日食、月食记录”,但这一表述似仍欲说明商朝的甲骨文最早记录了日食、月食,终难脱旧说窠臼。据《左传》昭公十七年载:“故《夏书》曰:‘表不集于房,瞽奏鼓,啬夫驰,庶人走。’”是说《夏书》记录了当时发生在房宿位置上的一次日食、不懂得自然规律的人们鸣鼓夺走的景象。这才是迄今所知世界上最早的日食记录,属夏朝天文学成就。(参见郭沫若:《中国史稿》第一册第145～146页)“最早”之属$陕西省商州…     

分析语言 再现形象——四册《看月食》教学难点的突破

一、教学难点及分析《看月食》这一课,通过叙述一家子晚上看月食的故事,介绍了月食的经过和月食发生的原因。月食有一个过程,“看”月食就是“观察”月食的经过。写月食发生的经过的段落是第四自然段。第六自然段写了月亮复原的过程。第四自然段和第六自然段都是写月亮的变化,但由于月亮的变化有所不同,两段的描述也就不同,由于这两段使用的语言有相似的地方,只是语序上有所不同,所以学生极易混淆。     

失落与追寻——再读《月食》

第读《月食》,我总感到心弦震颤,心潮奔涌,灵魂升腾,作品中的一些动人情节,常使我热泪盈眶,不能自已。 《月食》在我们面前铺展开一条曲折崎岖的路。这是一条坎坷的人生之路,也是小说的主人公伊汝在春回大地、恢复工作之际,正急匆匆地登上的重返山村的旅途。他心急情切,又犹豫不安;他似乎在回忆,又象在寻求。他究竟失落了什么,又在追寻着什么呢?     

《看月食》教学体会

《看月食》一课,课文本身的科学性很强。月食这一天文学中的自然景观,本来是地球在自转的同时,围绕太阳公转到月亮和太阳中间,三者几乎成一条直线时,挡住了月亮而形成的。可是,过去有的人认为是天狗吃了月亮。所以我力求做到:通过本课的学习,在教师准确讲授(借助挂图)的基础上,使学生了解月食形     

教学《看月食》小结

教学《看月食》小结刘少华一、一框抽位片演示月相变化我们知道，《看月食》一课写的是爸爸、姐姐和妹妹三人看月食的故事。学生们学了课文，应懂得月食不是天狗吃月亮，而是地球挡住了太阳光产生的自然现象。那么月食的形成及原因，如何让学生学得轻松，掌握得扎实呢？这...     

《看月食》教学中的“二续”“一看”“四向”

《看月食》(九年义务教材第四册第19课)是一篇讲读课文,讲的是爸爸带“我”和妹妹看月食,妹妹明白了月食是地球挡住了太阳光的缘故,说明有了科学知识能破除迷信。重点是理解描写月亮变化的语句和爸爸的话,从中了解什么是月食及月食形成     

微机在《日食和月食》一课中的运用

人教版小学自然第 1 2册第 1 4课《日食和月食》属小学自然宇宙教学单元 ,在以往的教学中 ,教师是借助三球仪、白色足球、光源等为数不多的教具 ,使学生知道什么是日食和月食 ,进而明白日食和月食的成因。由于受教具、学生知识水平等因素的影响 ,使得本课成为教师难教、学生难学的一课。为了改变这种局面 ,我尝试把微机引入本课教学 ,收到了较好的效果。ａ .用微机的动态显示 ,导入新课。本课是在学生学习了《地球的自转和公转》、《月相的成因》基础上 ,指导学生认识日食和月食的成因。新课的导入就从学生学过的上述知识点中入手并借助微机…     

简易的日食和月食现象投影片

讲授《日食和月食》一课时,如果让学生亲眼看到“日食”和“月食”现象该多好啊!制作一框日食和月食现象投影片就能实现这个愿望。 一、制作方法: 1.定片(见图一):找一张薄纸     

语文第四册24课 《看月食》的教学设想

一、要认识教材的特点列宁说过:“我很了解,爱听美妙的故事是儿童的天性。”《看月食》这篇课文,就是以故事的形式,向儿童叙述月食的经过和发生月食的原因。故事在介绍了月食的时间以后,由奶奶所讲“天狗”吃月亮的速信传说引入,形象具体地叙述了月食的全过程,     

实验激发兴趣 探究揭示奥秘——《科学》第一册《日食和月食》教法探讨

《日食和月食》是浙江省义务教育课程标准实验教科书7年级《科学》第一册第3章《地球与宇宙》第6节的教学内容 ,是发生在我们身边的重要自然现象。但由于这些现象不很常见 ,其产生的原因又不易直观理解 ,因而长期以来 ,这两种自然现象被蒙上了一层神秘色彩。为揭示其中的奥秘 ,本人通过模拟演示、分析推理、综合比较和实际观测等方法 ,让学生对日食和月食有了更清晰的认识 ,对产生的原因有了更深刻的理解 ,取得了良好的教学效果。一、景象描述 ,激发兴趣日食和月食的产生成因 ,即便是有一定感性认识的成年人也不易说清楚 ,对于几乎没有亲历…     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.