— May I ____ your Maths problems? I forgot to do that in class.
— Of course. _____, you just have five minutes.
A:copy down; And
B:write down; However
C:write down; And
D:copy down; However
①身体外形的变化 ②内部器官的完善 ③性机能的成熟 ④产生心理矛盾
This boy ____ ____.