题目

Martin is James and Sandy's father. He is forty-five years old and works on a farm. He can see them on Saturday. Today is Saturday. James and Sandy are happy to see their father. They have got some money from their father too. “What do you want to buy with your money?” says Sandy.“I want to buy a concert ticket and some candy. It's a good way to have a rest. I'm a little tired after a week's hard (努力的) work. My classmate Jack also wants to go there,” answers James. “What about you?”“I want to buy a scarf for our mother. It's cold now, you know, and she needs a scarf.”“O某男子的父亲患血友病，而他本人血凝时间正常。他与一个没有血友病家族史的正常女子结婚，一般情况下，他们的孩子患血友病的概率是 A.1/2          B.1/4          C.0            D.1/16