在光滑水平面上，动能为E₀、动量为p₀的小钢球1与静止小钢球2发生碰撞，碰撞前后球1的运动方向相反.将碰撞后球1的动能和动量大小分别记为E₁、p₁，球2的动能和动量的大小分别记为E₂、p₂，则必有(   )

A．E₁＜E₀

B．p₁＜p₀

C．E₂＞E₀

D．p₂＞p₀

It was funny to see that the dog’s eyes immediately ________ at the sight of its owner. 

A．lit up

B．fixed up

C．did up

D．turned up