— Kobe, are you willing to train your son to be a professional player?

— Frankly speaking, I hope he can do whatever _____ his interests. [ ]

A. fits

B. matches

C. suits

D. needs

使用K2．5探头对钢轨焊缝轨底脚边40mm～55mm范围应采用（）。

A、一次波

B、二次波

C、一、二次波

D、三次波