— What did Kincaid say just now?  

— He said he ________ a dog if he hadn't been away from home too much.  [ ]

A. had had        

B. had        

C. would have        

D. would have had

为了保卫我国diayudao的主权，我空军某部在实战演习中，空降兵高空跳离飞机后先加速下降，最后以较小速度平稳着陆，到达战略目标．以下说法正确的是（　　）

A．空降兵的动能越来越大

B．空降兵受到的是平衡力

C．空降兵受到空气的浮力不变

D．空降兵的重力势能减小