根据短文内容，从短文后的选项中选出适当的选项补全短文，并将选项的编号依次填人下边表格内。(共5小题，每小题1分；计5分)

It is my 12th birthday today．When I’m having my breakfast，my friends come with presents (礼物) for me．I am so happy to see them．We go to the sports club (俱乐部) to play．Then we have lunch at Mc Donald’s．

At about 5:00 in the afternoon we come back home．Mum makes a big birthday cake and  the cake has my name on it．I get (收到) many birthday presents --- a blue T-shirt from mum，sports shoes from dad，a book from my sister Lucy，a basketball from Georgina and a bag from Devin．

I have a happy birthday today!

小题1:--- How old am I today．

--- I am twelve ____________ old．

小题2:We have lunch at ____________．

小题3:--- When (什么时候) do we come back home?

--- At ___________．

小题4:My mum gives a blue ____________  to me as a present．

小题5:--- Who buys me a book?

--- My ___________．

为了使快速降落的“神州五号”返回舱安全着陆，以免撞坏，返回舱在距离地面几十米处，向下迅速喷出高压气体，从开始碰气到安全着陆，返回舱的[ ]

A．动能增加，重力势能减少，机械能不变

B．动能减少，重力势能减少，机械能减少

C．动能减少，重力势能增加，机械能不变

D．动能不变，重力势能减少，机械能减少