新文化运动时“打倒孔家店” 和汉武帝 “独尊儒术”，二者对儒学的态度截然不同，造成这种不同的本质上的共同原因是 （   ）

根据短文内容回答下列问题。

    Long, long ago there lived an old man. He had a very big orange tree in his garden. On the tree there were many fine oranges.

    One day the old man found one of the oranges was bigger than the others. It was as big as a watermelon. So he took the big orange to the king. The king was very happy and gave the old man a lot of money for it.

    When a rich man heard of this, he said to himself, "It is only an orange. Why did the king give him so much money? If I take my gold cup to the king, he will give me much more money for it."

    The next day when the king got the gold cup, he said to the rich man,"What a beautiful cup! I'll give you something for it. Please take the great orange."

人类的白化病是隐性性状，用隐性基因（a）来表示，现有一对正常夫妇，生出一患白化病的小孩，基因组成为（aa），请问这对夫妇的基因组成是（　　）