题目

Hi, I’m Jack. I like weekends____I don’t go to school. Let me tell you what I usually do on___? In the morning, I don’t need to get up ___. At about 9 a.m., I only have some bread for breakfast. Then I___. At about ten o’clock, I start(开始)to do my homework. My family always have a ___ lunch on Sundays. We eat for about an hour, and chicken is my favorite food. In the afternoon, I usually play ___ with my friends for two hours. It’s relaxing for ___to do sports. What about Sunday evenings? At about six o’clock, I have dinner with my ___. But sometimes we eat out. Do we watch TV 已知数列{log2(an?1)}n∈N*为等差数列，且a1＝3，a3＝9 (I)求an (II)求证