● 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 K+3dk0pZcVWluMHeh4PhG09mPhrMZ5I9H+tFmE3tFx74Cpo/S7C6O9JYqepvf6ik
