福寿螺是国家环保总局公布的首批入侵我国的16种危害极大的外来物种之一。我国创建出如下图的稻鸭绿色农业生产模式，防治福寿螺。据图回答：

如图所示，小球P连接着轻质弹簧，放在光滑水平面上，弹簧的另一端固定在墙上，O点为它的平衡位置，把P拉到A点，使OA=1cm，轻轻释放，经0.4s小球运动到O点．如果把P拉到A′点，使OA′=2cm，则释放后小球这一次运动到O点所需的时间为（   ）

   My hobby is table tennis.____  table tennis is an energetic activity. I know it isn’t very ____ .but I find it very interesting .I am good at table tennis and I enjoy my____  when I win a game. In my free time, I like reading. I like to sit down with a book. When I read, I ____ what’s____ ,and how the people feel.

wear,  we,  style,  other,  tell

A: Hi, Xu Hui! I hear that our school will make uniforms for us. Do you like wearing school uniforms?

B: Not really. I don't like wearing the same clothes as ____. It's boring.

A: What kind of clothes do you like to ____?

B: I like to wear clothes of my own ____. They're comfortable and make me feel good. But uniforms sometimes look ugly on us.

A: But the school uniform can show us good discipline.  Do you think so?

B: Yes, I agree. I think we students can design our uniforms by ____.

A: Sounds interesting! If we can design our own uniforms, we'll be glad to wear.

B: That's right. Let's write a letter to the headmaster and ____ him about our ideas.

A: That's a good idea!