问题
选择题
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
答案
答案：D
定语twelve-year-old，表示十二岁的，而twelfth为序数词，故选答案为D