—Hurray! Actually these competitors were all strong, but our students made it.
A：finished
B：succeeded
C：preferred
A，B，C三点在同一条直线上，一物体从A点由静止开始做匀加速直线运动，经过B点的速度是v，到C点的速度是3v，则xAB：xBC等于（ ）
I like my toy plane. It can fly. It's .
