She      a golden ring when she searched her old box for a letter.

A．came about

B．came to

C．came across

D．came up with

若神经损伤修复后，其再生的速度平均每天以多少计算（）

A.0.5~1mm

B.1~2mm

C.2~3mm

D.3~4mm

E.4~5mm