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教学步骤：
Step 1 Greeting & Sing a song
1. Greeting
T: Hello, boys and girls.
T: Nice to meet you.
2. Sing a song
T: I have two animal friends, one named Jack and one named Jill. Do you want to meet them?
T: OK, listen! Here they are. (播放歌曲“Two little blackbirds”一遍)
T: Do you like this song? Now follow me. (老师带着学生用手势表示歌词内容，学生边唱边学做动作) This time, let’s try to sing and do some actions together.
(再次播放歌曲，学生加上动作一起唱)
Step 2 Presentation
1. Talk about City A
T: A lovely song, yes?
T: (教师利用歌曲“Two little blackbirds”向学生提出几个关于鸟的话题)
Do you like birds?
What birds do you know?
Can you see any birds in our city?
Where can you see any birds?
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) These pictures are of City A. What can you see in the pictures?
T: Do you like this city? Why?
S: …
2. Talk about City B
T: OK. Now let’s look at some pictures of City B. (用PPT展示另外一组城市图片) Is it clean?
T: It’s not clean. It’s dirty. (新授dirty，让学生跟读几遍)
T: What can you see in the river? (用PPT呈现河流的图片)
T: The fish are dead. (新授dead，让学生跟读几遍) And the river is _____.
T: The river is dirty. There’s rubbish and dead fish. (同样方法新授rubbish) So rubbish makes the river dirty. (展示句子… makes … dirty，并让学生跟读几遍)
T: What can you see in the street? (用PPT呈现街道的图片)
T: How do you think of the street?
T: Yes, it’s dirty and it’s messy, too. (展示单词messy) So what makes the streets messy and dirty?