It is generally accepted that _____ boy must learn to stand up and fight like _____ man.

A．a; a

B．a; the

C．the; the

D．a; 不填

欧几里德：祖冲之

A．哈维：袁隆平

B．欧·利：施耐庵

C．莎士比亚：李四光

D．霍金：徐霞客