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smoke,factory, smoke, dirty, clean, plant : It keeps them high in the sky. ?! ?keeps them high in the ?! ?. Watch the screen and learn to say the sentences. 5. Ask pupils to talk about the famous cities of the world in groups . Sept ⅢLearn the story (文本學(xué)習(xí)) T: Here’s a riddle. It’s very long one. Please listen carefully and guess what it is. What is it? Ss: Air. T: Yes, What do you think of air? S1: Air has no colour. S2: Air has no smell and taste. S3: … T: Yes. We can’t see it,but we can feel it. Air is important to all living things. T: Can you talk about air? Work in groups . Ss: talk each other. Tasks the pupils to answer the questions on Page 69. Step ⅣCo