补全对话
A: You look upset. What’s the____ ?
B: Oh. I had a big fight with my cousin yesterday.
A: Why?
B: She wanted to ____  my homework.
A: It’s not a good habit. She should do her____  homework.. Well, you could call her up and talk about it____ the phone.
B: She was ____ at me and didn’t talk to me.
A: Don’t worry. I think she will get over it.                   
B: I hope so.

 湖面如镜，划桨泛舟．以划船的人为参照物，小船是____ 的；水鸟掠过湖面时，翅膀上方空气流速____ （选填“大于”、“小于”或“等于”）下方，翅膀上下表面存在压强差，形成升力．

比４的相反数小3的数是（　　　）．

下列物质的有关用途，由其化学性质决定的是    （   ）

关于物体运动状态的改变，下列说法中正确的是（  ）