用合适的句子补全对话

Salesman : Can I help you,Sir?

Mr. Ross : May I see a hat , please?

Salesman :   1   Mr. Ross : I'm sorry,l don't know.

Salevman: I'll measure you…You take size 6.  2   

Mr. Boss : Brown , please.

Salesman: Here are some nice brown hats.  3   It's a very good one.

Mr. Ross : Yes,l like this one. It goes very well with my coat.  4   Salesman : It's  $9. 95. Do you want me to put it in a box?

Mr. Ross:     5  .   Thanks a lot.Salesman : It's a pleasure.

从地面竖直上抛一个质量为m的小球，小球上升的最大高度为H。设上升和下降过程中空气阻力大小恒定为F。下列说法正确的是

A小球上升的过程中动能减少了mgH

B. 小球上升和下降的整个过程中机械能减少了FH

C. 小球上升的过程中重力势能增加了mgH

D. 小球上升和下降的整个过程中动能减少了FH