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Must we exercise to prevent the flu? No, we don’t have to./No, we needn’t.
Skill aims：
1. 能听懂看懂 有关预防流感的对话或文章。
2. 能谈论有关预防流感的话题，能熟练地运用must问答，表示征求意见或提建议。
3. 能正确地用书面形式表达有关预防流感的话题。
Emotional aims：
1. 学生能够听从他人建议，懂得进行适当锻炼，预防感冒。
2. 强化学生学会用first, second, third, finally谈话或写作，增强条理性。4．教学重点、难点分析 教学重点：
1.first, second, third, finally，keep away from, take some cold pills, go to crowded places, play sports too much等单词，短语的理解及运用。
2.Must we exercise to prevent the flu? Yes, we must.
Must we exercise to prevent the flu? No, we don’t have to./No, we needn’t.
教学难点：
1. May I ask you some questions? some 在疑问句中的运用。
2. Must we…? 的回答语 No, we don’t have to. / No, we needn’t.5．教学过程设计Step1：Warm up
Listen to an English song about This is the way I wash my hand .Then sing it together.
(设计意图：在热身部分通过歌曲安定学生的情绪，调动学生学习兴趣，让学生轻松进入本课的学习，激发学生学习热情。)
Step2：Revision
Review the illnesses in Topic 2.
(There is something wrong with my eyes. So I say :Look at your poor English teacher, what’s wrong with me? The students answer: You have sore eyes .Then lead to the illnesses. Ask 8 students to spell the 8 illnesses.)
Review the unhealthy habits and healthy habits.
What causes so many illnesses? It is because of the unhealthy habits.
① smoke (shouldn't)
② eat too much (had better not)
③ eat too much candy (shouldn't)
④ throw litter around (mustn't)
⑤ read in the sun (shouldn't)
⑥ keep fingernails long (mustn't)
⑦ spit everywhere (mustn't)
⑧ stay up late (had better not)
What are the good habits we have learnt in Topic2? Let’s watch the video together.