补全对话。根据图片所示补全对话，一空一词。

A: Class Five1._____a fashion show last Friday. Did you go there?

B: Yes, I 2._____

A: But I 3._____ see you.

B: There were too many people. I didn't see you, either.

A: There was a 4._____ at the show. Did you 5._____her?

B: What did she wear?

A: She 6._____ a black 7._____ and long brown 8._____. She had black hair in a 9._____.

B: Did she wear 10._____?

A: Yes.

B: Yes, I noticed her. She looked very cool.

一个带正电的小球以速度v₀沿光滑的水平绝缘桌面向右运动，飞离桌面边缘后，通过匀强磁场区域，落在地板上，磁场方向垂直于纸面向里（如图所示），其水平射程为s₁，落地速度为v₁，撤去磁场后，其他条件不变，水平射程为s₂，落地速度为v₂，则（　　）

A．s₁=s₂

B．s₁＜s₂

C．v₁=v₂

D．v₁＞v₂