● 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 EslA7Jaw2iCbZCpRHy/j7B4RHoh0f4YBdcaUDpH/51bRv9Slga5VYaN+e9pBt0oR