听音，根据情境，选一选。 
1、你想说下午好。           A.Good morning.          B.Goodafternoon.
2、你想说再见。             A.Hello.                   B.Goodbye！
3、你要问别人“你好吗？”    A.How are you?           B.How old are you?
4、你想问那是什么？         A.What’s this?          B.What’s that?
5、请别人坐下。             A.Stand up,please.       B.Sit down ,please.
6、你要问“你多大？”       A.How are you?           B.How old are you?