下图为某家族白化病的遗传系谱图（基因用A、a表示），请据图回答：
Ⅱ3的基因型是（）
参考答案：Aa正常
显性基因控制隐性基因，隐性基因控制隐性性状。 [ ]
The old man enjoys collecting signatures of famous people _______ famous paintings. [ ]
A. with preference of
B. in preference to
C. in preference for
D. with preference to
