Unit11 Planting Trees(Lesson 42)教案(2)

冷暖人生

1、电脑播放雨水冲刷土壤，造成水土流失，冲垮山坡、河堤，淹没田地、村庄；狂风吹起沙尘、沙丘，埋没田庄的影片。在播放影片的同时，用录音机播放英语说明（解释），并用幻灯机显示有关生词、短语：rain、drops、soil、directly、stop from、blow (run、wash )away、 towards、farmland、thanks to等，让学生看着相对应的影片学习新生词、短语。随后幻灯机出示问题：What should be done for these?让学生分组讨论，激烈的讨论中形成了答案：Plant trees.接着出示另一个问题：Why trees should be planted？学生各持己见发表自己的看法，最后归纳：1)Forest help to keep water from running away .2)The trees keep rain drops from hitting the soil directly .3)Dead leaves on the ground keep the water from running away.总结: 1)So drought doesn’t often happen .2)Flood are prevented.

2、电脑播放“绿色长城”区域刮风、下雨的影片，使学生目睹由于森林阻挡了狂风的势头，风力无法把沙尘、沙丘吹起和雨水击打在树木和地上的树叶、小草上，水缓缓而流的情景。同时幻灯机出示问题：Why should the Great Green Wall be built in China?让学生分组讨论，归纳各组意见形成答案：Because forests can :1) keep rain drops from hitting the soil directly .2)stop the wind from blowing the earth away.3)stop the sand from moving towards the rich farmland.等。总结：So many more Great Green Walls must be built not only in China .They must be built all over the world.

3、学生听课文录音后，阅读课文；幻灯机出示以下表格，让学生完成下列表格。

	the Great Green Wall
Special features	1、It is a “Great Wall”of trees, millions of trees. 2、It crosses the northern part of China. 3、It’s 7,000km long ,between400 and 1,700km wide.
Function	1、It stops the wind from blowing the earth away. 2、It stops the sand from moving towards the rich farmland. 3、It keeps rain drops from hitting the soil directly.
Wangfen and other workers	1、They work at Yulin in shanxi Province. 2、They have planted ten thousand trees this year. 3、It’s difficult to work on the Great Green Wall. 4、They have to grow their own food.

4、让学生观看绿色长城的影片和幻灯机出示的表格，复述the Great Green Wall.

（四）、启迪作业。

让学生查阅有关资料，根据以下表格以Sanbei Shelter-forest 为题作文。

	Sanbei Shelter-forest
Including
Total area
Function

五、教师自我评价：这节课课堂气氛有张有弛，学生兴趣盎然，情绪高涨，在课堂教学活动中充分发挥了自己的积极性、主动性和创造性，使学生成为了课堂的主人，体现了以学生为主体，以教师为主导的思想。

六、学生学习反馈：学生的积极性、主动性十分高涨，79%的学生能口头复述课文，68%的学生能查阅有关资料，写好作文Sanbei Shelter-forest。

七、学科组意见：该教师根据教材和学生的实际情况，合理、恰当地让多媒体走进课堂，激发了学生学习的兴趣，调动了学生学习的积极性，增强了记忆力，培养了学生听、说、读、写、思等方面的能力，大大提高了课堂教学效率，减轻了学生负担，真正实现了向45分钟要质量的目的。

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