本课是第四单元第一个话题的第一课，主要活动是1a, 2a和3a。主要学习与购物相关的表达，包括提供购物帮助的表达“What can I do for you?”，“May/Can I help you?”；询问价格的表达“How much...?”，同时还学习了1000以内的基数词的英语表达法。This topic is the first period of Unit 4. Including  Listening and Speaking. The topic is about the shopping. It is a very important part which is not only related to daily life, but also can arouse students’ passion and activity and help them master key words and sentences that lay a foundation for reading and writing.