通过指针链来表示和实现实体之间联系的模型是A．层次型 B．网状型 C．关系型 D．层

补全对话。（有两项多余）（5分）

A.Did you use to play the piano?     B.You’ve changed a lot.          C.Don’t you remember me?   D.I am on the swim team.       E.That is right. F.I wasn’t very outgoing. G.You look different.

Girl: Hey, Steve! Over here! ____1____
Boy: Oh, wow! You are Paula, aren’t you?
Girl: ____2___
Boy: But you used to be really quiet, didn’t you?
Girl: Yeah. ____3___
Boy: No, you weren’t. But you were always friendly.
Wait a minute! ___4___
Girl: Yes, I did. But now I am more interested in sports. I play soccer      
and ___5___
Boy: Wow! People sure change.