It's Saturday afternoon now . Sally and Sam are talking about what they are going to do tomorrow.
Sally: What are you going to do tomorrow?
Sam : Oh, I'm going to watch a football match .It's my favourite team, Manchester United .
Sally : Great ! I really like the team, too. What time is it going to be?
Sam : At three o'clock in the afternoon. I have two tickets here . Would You like to go with me ?
Sally :I'd love to . But I’m sorry I can't . We're going to have a basketball game tomorrow afternoon .
Sam : It doesn't matter(没关系) . Who are you going to play against（对抗）?
Sally : A team from No.2 Middle School .
Sam : Where are you going to play ?
Sally :In our school .
Sam : Good luck to you!
Sally :Thanks . Have a good time . See you later .
Sam :See you. 

随着摆幅的增大，摆动的速度会变快。

下列材料中：①高分子膜；②生物高分子材料；③隐身材料；④液晶高分子材料；⑤光敏高分子材料；⑥智能高分子材料。属于功能高分子材料的是(　　)

设$P=\frac{1}{{\log }_{2}11}+\frac{1}{{\log }_{3}11}+\frac{1}{{\log }_{4}11}+\frac{1}{{\log }_{5}11}$则（   ）

在短周期元素中，原子最外电子层只有1个或2个电子的元素（）