Tom is ____  younger of the two newcomers. To be honest, I have never seen _____cleverer one.

A．/,/

B．a, the

C．the, a

D．/,a

钢轨探伤，37°探头对应通道，在报警门后沿附近有反射回波，应考虑（），并用反光镜等手工检查方法确认。