● 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 GJmB2MWHlR7r6SMnizpKdE296P8Y7Nd1U1tIILxN/8d8gJz5nJs/UOiYTH4gfSO7