阅读《浣溪沙》，根据要求回答问题。
                                                                                                                                 浣溪沙
                                                                                                                                   晏殊
                                                                                           一曲新词酒一杯。去年天气旧亭台。夕阳西下几时回？
                                                                                           无可奈何花落去，似曾相识燕归来。小园香径独徘徊。

分析下面图解判断以下哪一项不是精子、卵细胞发生的区别(　　)。

如图⊙O中，弦AB与弦CD相交于点P，∠B=38°，∠APD=80°，则∠A等于（　　）