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培养学生的口语表达能力。
能通过整合对话内容，提升综合语言运用能力，为语言输出做好准备。
3.Emotional aims: (optional)
引导学生了解环境污染问题，热爱环境，保护环境。
三 The key points and difficult points
1. Key points:
New words and phrases.Sentences: None of us likes pollution.
2. Difficult points：
能通过听、说和读的方式感知并掌握不定代词.的用法。
能区别并会恰当使用不定代词。
四．Teaching procedures
Step 1: Greeting and lead-in.
Present the picture of animals, get the Ss to ready for the new class.
Step2: Presentation
1.Present the new words.
2.Get the Ss to number the pictures in 3 to know how the sandstorms come into being.
3.Get the Ss listen to 1a, and choose the best title, finish 1b.
4. Let the Ss listen to 1a again ,and answer questions.
5.Let the Ss discuss the key points and solve the problems by themselves in 1a.
Step3:Consolidation
1.Let the Ss read 1a and complete trees’ functions.
2.Read 1a and then act it out.
Step4:Practice
Ask the Ss to finish 2 by using the given words.
2.Listen to 4A, 4B then finish them.
Step 5: Exercise ,Summarizing and assigning homework