Yao Ming put his effort _____ basketball training _____ a very young age.
A：to, in
B：to, at
C：into, in
D：into, at
詹天佑主持建成的唐胥铁路是第一条由中国人自己设计和修筑的铁路。____
血红蛋白的特性决定了红细胞的主要功能是（ ）
