________ in 1963, and ________ in Philadelphia, Charles Pettigrew so impressed his teachers that he was sent to Barklee School to study Jazz.

A．Born; raised

B．Being born; having raised

C．Was born; was raised

D．Born; raising

一位网球运动员以拍击球使网球沿水平方向飞出．第一只球落在自己一方场地上后，弹跳起来，刚好擦网而过，落在对方场地的A点处，如图所示．第二只求直接擦网而过，也落在A点处．设球与地面的碰撞过程没有能量损失，且运动过程不计空气阻力，试问：

①两只球抛出时的初速度之比v₁：v₂为多少？

②运动员击球点的高度H与网高h之比