题目

甲 乙两车同时同地同向运动，甲车初速度为30m/s，以加速度大小为a1匀减速刹车，乙车初速度为10m/s，以加速度a2匀加速运动，经过10s两车速度相等．在乙车追上甲车之前两车之间最大距离为x．则（  ）                                                                                                                             A． a1越大x越大     B． a2越大x越大    C． x一定等于100m    � The school was moved out of downtown as the number of students had grown too 　 ． A．small　　　　　 B．few　　　　　　 C.large　　　　　 D．many