下图为“四国城市人口比重变化示意图”。读图完成下列问题。

阅读下面短文，从短文后所给的A、B、C、D四个选项中选出能填入相应空白处的最佳选项。

    My name is Brad. I'm 1 Sichuan. I'm a(n) 2 monkey and I am only one year old. I like eating 3 and bananas are my favorites. I like forests(森林),but now I live in a 4 . I am in a big cage(笼子) 5 other monkeys. People like me and often give me some fruist to eat. 6 I'm not really happy. 7? Because I can't live with my parents and I can't climb trees(爬树) here. Every day, I get up in the cage. I eat food in the cage. I 8 and relax in the cage. I really want to 9 my parents and climb trees in the forests. Dear people, animals are your 10. We live in the same world. Please let us live in the forests, not in the cages.

已知三角形PAD所在平面与矩形ABCD所在平面互相垂直，PA=PD=AB=2，$\angle APD=90°$，若点P,A,B,C,D都在同一球面上，则此球的表面积等于(     )