Jim is a ____ boy, and today is his _____ birthday.

A．twelve-years-old, twelve

B．twelve-years-old, twelfth

C．twelve-year-old, twelve

D．twelve-year-old, twelfth

国家对枪支实行查验制度，持有枪支的单位和个人，可以在持枪所在地接受查验。