—Now that you like computers very much, isn’t it a good idea to get ______?

—Well, I’d like to but I can’t afford that expensive a computer at present.

A．one

B．them

C．it

D．that

较长时间剧烈运动后即刻站立休息，运动员易出现（）。

A.过度训练

B.重力性休克

C.中暑晕厥

D.心源性晕厥