教學設計Step 1 Teaching aims 1, Improve the listening and speaking skills. 2, 學習完成任務所需要的語言 3，學會含有大數字的度量結構的表述，并掌握用不同的句式表達比較級和最高級。Step 2 Preparations PPT, I Have a Dream 視頻Step 3 Key points and difficulties 1, 學習并掌握表達物體的長、寬、高、深和面積。正確運用形容詞和副詞的比較級和最高級 2，學會含有大數字的度量結構的表述。 3，提高聽說能力。Step 4 Teaching process 1, Leading in 出示四張圖片，讓學生認識四個圖片所代表的地區。 2, PresentationQuestions1a (1) Look at the four pictures. Match the facts you know. (2)Check the answers.Listening1b (1) Ask students to listen to the tape carefully. (2) Check the answers. (3) Key points: 比較級+than any other +n.(單)=最高級+n.(單)Practice1c (1) T: What is the biggest desert in the world? S: The Sahara. T: How big is it? S:Its about 9,600,000 square kilometers in size 以此對話為依據進行小組活動，用所給的圖片和詞組編對話。 (2) 教師制定小組進行對話表演Listening2a2b (1) Ask students to listen to the tape carefully. (2) Check the answersRole-play the conversation (1)Ask student to read the conversation in pairs. (2)Translate the conversation. (3)Key points: feel free to do sth. 一種口語表達，無拘束做某事，按照自己的意愿做某事。 As far as I know固定表達，“據我所知” 3, Practice 4, Sum up Words and phrase: square, meter, deep, desert, population, Asia, feel free, tour, tourist, wall, amazing, ancient, protect, wide,as far as I know. Sentences: How big/high/long is .? What is the +最高級+n.+in the world? 形容詞比較級+than any other +n.(單) =形