一、学习目标：
知识目标：
1. —How much is the red sweater? —It’s eight dollars.
—How much are these black pants? —They are ten dollars.
2. —Thank you (very much).
—You are welcome. / That’s all right. / Not at all.
3. 基数词和反身代词
能力目标：
Ask about price. 询问价格
Talk about clothing. 谈论衣物
Thank someone. 感谢他人
