阅读下面短文，根据短文内容回答问题。

    My name is Grace. Today is Sunday. It is a nice day. It is also my grandfather's birthday. He is 80 years old. My parents and I go to his home. We don't get up early because the alarm clock (闹钟) doesn't work. We don't have much time for breakfast. We go to a supermarket to buy some fruit and a birthday cake at eight thirty. Then we go to my grandparents' home quickly. We get there at 11:15. My grandparents are very happy to see us. We have lunch at 12 o'clock. After lunch, we play chess with my grandfather. It is interesting. We go home at about four o'clock in the afternoon. It is a happy day.

写作。
        爱，也许是母亲的的一句叮咛，也许是父亲的一次轻抚，也许是老师欣慰的微笑，也许是同学真诚的帮助……
        爱，是润滑剂，是氨基酸，是人生的蜜糖。因为爱，我们的心田碧波荡漾；因为爱，我们的生活洋溢着芬芳；因为爱，我们的学业蒸蒸日上；因为爱，我们的灵魂熠熠生辉……
        请你以“关爱”为话题写一篇文章。题目自拟，记叙文，不少于600字。

家族性多发性结肠息肉是一种显性遗传病，双亲中一个是基因组成为Ee的患者，另一个表现正常，那么，他们的子女发病的可能性是（    ）

若数列{a_n}的前n项和S_n=n²+1 则a₁+a₉等于（　　）