—Would you like to go to the cinema with me tomorrow afternoon?

—I’d like to, Mum, but I ________ to a party by Jane. It is her birthday.

A．am invited

B．was invited

C．will be invited

D．have been invited

如图，一个质量为0.6kg的小球以某一初速度从P点水平抛出，恰好从光滑圆弧ABC的A点的切线方向进入圆弧（不计空气阻力，进入圆弧时无机械能损失）．已知圆弧的半径R=0.3m，θ=60°，小球到达A点时的速度为v=4m/s．（取g=10m/s²）试求：

（1）小球做平抛运动的初速度v₀；

（2）P点与A点的水平距离和竖直高度；

（3）小球到达圆弧最高点C时，对轨道的压力．