In the Beijing Olympics, Phelps from the US is____person of wonder, ____person who swam into the Olympic history.

A．the; the

B．the; a

C．a; the

D．a; a

试述杂交育种中如何进行亲本的选择和选配，以一种无性繁殖的园林植物为例，制定其有性杂交育种的技术路线和实施方案。