问题
选择题
Peter is a _______boy. His younger brother is _______.
A．ten-years-old ; six years old
B．ten years old ; six years old
C．ten years old: .six-years-old
D．ten-year-old ; six years old
答案
答案：D
第一空ten-year-old是复合形容词，表示“十岁的”，三个词之间有连字符，名词用单数。第二空做表语，不用连字符，名词用复数。