(二)运用多媒体,加大教学密度,提高教学效率,提高学生创新能力。运用计算机多媒体技术可以做到高密度的知识传授,大信息量的优化处理,大大提高课堂效率。图形不是语言,但比语言更直观和形象,比语言包容的信息量更大。动画比图形更先进,运用文字闪动,图像缩放与移动,颜色变换的手段,不仅容量更大,速度更快,效果也更好,加大了教学密度,提高了教学效率。例如:在教七年级下册Unit 3 I"d like a large pizza这一单元时,有很多食物方面的单词,像pizza,pepperoni,green peppers,mushrooms,onions,cheese,olives,tomatoes,hot dogs,soda,lemonade,iced tea,juice,salad,hamburgers等等。这些食物有些学生都没有见过,学起来枯燥,难以记住。笔者课前找到这些食物的图片,以动画形式设置在图画中并配有单词发音。教学中,教师点击图中设有单词的动画,让学生看实物图片读、记单词。有趣的画面,吸引了学生的注意力,加深了他们对单词的印象;同时引导学生说一些分别包含这些单词的日常用语,学生的情绪一下子调动起来,不知不觉地进入了学习情景中,并能很快说出这些单词。多媒体软件向学生直观地呈现了语言材料的示范表情、动作,为学生随后的表演提供了可模仿的生动、具体的情景。这样,在多媒体软件提供的图文并茂的情景中,学生边看边听,视听结合,成为感知的主体,学到了新的知识。教学效果事半功倍,大大提高了教学效率。
(三)合理运用多媒体技术, 启发学生深层理解与思考的能力。 教材中,涉及到许多社会问题,这些问题都是培养学生对社会责任感的很好素材,因此,教学中,可以根据课文内容,选择一些有感召力的素材来启发学生思维,培养其对社会,对他人的责任感。例如, 在讲到有关环境保护时, 笔者先把事先准备的污水河的一组录像镜头展示给学生看, 然后又把中央电视台栏目拍摄的今年1月中旬至3月我国多地持续雾霾天气,空气质量重度污染特别报道: 北京街头市民出行戴面具的镜头展示在课件上,又把有关地下水污染需要一千年才能恢复的报道给学生看,同学们为当今我国的环境污染问题极为震撼, 于是我在屏幕上打出了这样几行醒目的大字:“what is happening to our environment?”“what do you think of it?”“what should we do?”接着,我把有关环境方面的词汇及句子呈现给学生,让他们讨论并写一篇相关短文。学生们写出了以下15个典型句子:
1. It"s our duty to save water.
2. As we know, water is very important to man.
3. we can"t live without water.
4.The amount of water which is suitable to drink is less and less.
5.But some people don"t care about it.
6.Many rivers and lakes are seriously polluted.Something must be done to stop the pollution.
7.Its our duty to protect our environment.
8.It is very important to take care of our environment.
9.We should not throw litter onto the ground.
10.We should not spit in a public place/ cut down the trees.
11.We should plant more flowers and trees.
12.We must pick up some rubbish and throw it into a dustbin.
13.If everyone makes contribution to protecting the environment, the world will become much more beautiful.
14.Trees are very helpful and important for us.
15.We should plant more and more trees in order to live better and more healthy in the future.It"s everyone"s duty to love and protect the environment. |