Today is father s day, for so many years I ve been seekig a way to express my heartfelt thanks for all you have done for me. Here comes it!
Thank you for always being there sharing my life when I need you most. Whenever I encounter difficulties, I never feel alone and vulnerable, because you will keep me on the right path. I m blessed to have you.
Thank you for offering me education and teaching me how to be a man. You always inspire me not by words, but by what you have done! Your efforts in the work, your loyalty to your friends, your responsibility for the family and your persistence in the life have already set me good examples in my own life.
Thank you for always appreciating my work, no matter how tiny it is! You have made me realize that it s capacity not scores that really counts.
Dad, I love you and I will love you forever!
Yours beloved,
Li Ming
对于教材中的重点及难点章节采取集体备课,在备课时要发挥骨干教师的辐射作用,开展以他们为主讲人的备课活动,在集体备课前主讲人要广泛收集教学素材,注重理论和实践结合,成功的集体备课能让所有生化老师群体受益,取长补短,相互启发,互相促进,从而保持教学多元化。
望着讲桌上的瓶瓶罐罐,大家心动神移,盼着精彩的到来。终于,优雅的铃声传到了每个同学的耳朵里,大家激动不已。
同学们,谁有办法不用火点燃我手里的酒精灯呢?任老师边说边举起那盏灯。不用火,怎么点燃?我正在冥思苦想,同学们也面面相觑。这时,一位同学举起手,缓缓地说:老师,能不能利用太阳光,反射放大镜的镜片上,使它燃烧呢?老师点点头,笑着说:这是一个好办法,谁还有更快捷的方法吗?大家摇摇头,欢闹的气氛一下子十分安静。我有办法,大家看好了!任老师边说边从盒子里拿出了一根玻璃棒,大家不由得睁大了眼睛
老师笑着对我们说:这可不是一般的玻璃棒,这是一根魔棒!于是老师将这根魔棒在一个碟子似的东西蘸了一些液体后,玻璃棒还是原来的样子,没有一点变化。老师用玻璃棒点灯芯,酒精灯一下子被点燃了。教室里一下子有沸腾起来。老师让我们静下来,说:大家先别兴奋,精彩还在后面呢!
接着,老师拿出来一块方格手帕,在一个盛满液体的杯子里涮了涮,然后请两个男生一人拿镊子夹住一头;老师拿火柴一点,全班一股烧烤的糊味,火沿着手帕在燃。这时,奇迹发生了,火越来越小,一会儿灭了。手帕却安然无恙,太神奇了。
这节课很快过去了,但还让我感觉意犹未尽,让我到了化学原来就是一个魔术世界!
演示实验是化学课堂教学的重要内容之一,它是通过教师的操作示范,把直观的实验现象展示给学生,是培养和提高学生观察思维能力的关键。而实验技能的全面提高,最终应是通过学生实验来完成。这就要求除完成规定的学生实验外,还应尽力创造条件,增设学生实验,或转化部分演示实验,让学生有更多地机会去动手操作。要重点指导学生分析操作要点,注意事项。
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