1)核心词汇：Core vocabulary:
谢谢 xiè xie v to thank
不 bù adv. no,not
不客气 bú kè qi you’re welcome,don’t mention it
再见 zài jiàn Goodbye,Bye

2)课后练习 After class exercises，Choose the correct meaning for each word

1.谢谢你
A: Hello B: Bye C:Thank you

2.不客气
A:Sorry B: You’re welcome C: How are you?

3.再见
A: Goodbye B:Thanks C: Don’t mention it

答案 Answer：1) C 2) B 3)A