● Unit 1 打招呼
● Unit 2 感谢及祝贺
● Unit 3 疑问及回答
● Unit 4 情感表达
● Unit 5 托付及劝诱
● Unit 6 日常表现 EQIAON4ljEAlonLEptcRvvioUonTeY2C8+o1tZo2vcQx8l1Zb0hB+3/reKUd+kfe
