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1.重点：学习并掌握以下词汇：ten, eleven, twelve, thirteen, fifteen, eighteen, twenty, thirty
2.难点：灵活运用所学数字10-31流利地询问价格。
Teaching steps（教学步骤）
1. Greetings
2. Revision
Listen to a song.
Listen to the song- Ten Little Indians. And then Write down the number 0---9 on the exercise book.
3. Presentation:
教授新单词：
10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31
ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty twenty-one twenty-two twenty-three twenty-four twenty-five twenty-six twenty-seven twenty-eight twenty-nine thirty thirty-one大屏幕出示数字，然后让同学们找出数字的规则。
4. Revision
(1) Daily greeting to the students（日常问候）
(2) Revision（复习）: Check the answers to 3b.
(3) Complete the conversation.
Woman: _____________________
Mary:Yes, please. I need a __________ for school.
Woman:OK. What color do you want?
Mary:__________.
Woman: How about ___________?
Mary:It looks nice. _______________?
Woman: Nine dollars.
Mary:________. How much are those __________?
Woman: ____________________ and eight dollars for two pairs.
Mary:Great! I’ll take two pairs.
Woman: ____________________
Mary:Thank you.
Woman: You’re welcome.
5. Presentation