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教学重点：能正确地理解并朗读对话内容，在教师的引导和帮助下复述课文内容。
教学难点：能初步运用本课所学的词汇和日常用语谈论城市的污染问题，并能说出多种解决方案。
Teaching procedures 教学过程
Step 1 Greeting &watch and answer
1. Greeting
T: Hello, boys and girls.
S: Hello, Mr/Miss …
T: Nice to meet you.
S: Nice to meet you, too.
2. watch and answer
T: I will show you a video. After watching it, please tell me what do you learn from it?
S: Yes.
T: OK, let’s enjoy it.
【设计意图：让学生通过观看视频说出自己的感受从而引出城市环境这一话题。】
Step 2 Presentation
1. Look and say
T: I’ll show you some pictures. (向学生展示一组风景优美、环境幽雅的城市图片，然后提出问题让学生思考和讨论，引入话题) Look at the pictures and tell me what can you see from the picture?
S1: I can see a lot of trees.
S2:I can see a house.
S3: I can see a lot of flowers.
S4:I can see some tall buildings.
S5: I can see a clean river.
S6: I can see a clean road.
S7: I can see a lot of beautiful flowers and trees.
S8: I can see some nice houses.
S9: ..........
T: Do you like this city? Why?(教师出示另外一组城市的图片)
S: …
【设计意图：让学生看图片进行讨论，激发学生思维，形成良好的学习氛围。】
2.T: OK. Now let’s look at some pictures (用PPT展示另外一组城市图片) Is it clean?