M12重点句子：
1.In the USA, when someone gives you a present, you must open it immediately.
2.In China, you must wait and open it later.
3.When you accept a present, you must use both hands.
4.You mustn’t do any cleaning on the first day of the Chinese New Year.
5.For example, you usually shake hands with people when you meet them for the first time.
6.You must say Mr and Mrs when you speak to older people, but you can use first names with your friends.
7.Then the woman mustn’t arrive at the church on time but a few minutes late.
8.And at the party after the wedding, the woman throws her flowers over her shoulder.
