The new equipment________the disabled during the 2008 Beijing Paralympics. [      ]

A. was intended for  

B. was intended to

C. intended for  

D. intended to

一质点沿直线Ox方向做变速运动，它离开O点的距离随时间变化的关系为x＝5＋2t³(m)，它的速度随时间t变化关系为v＝6t ²(m/s)．该质点在t＝0到t＝2 s间的平均速度和t＝3 s的瞬时速度大小分别为    ( )

A．12 m/s,39 m/s

B．8 m/s,54 m/s

C．12 m/s,19.5 m/s

D．8 m/s,12 m/s