2016年1月1日，我国正式实施一对夫妇可生育两个孩子的政策。下图为我国人口年龄构成图和人口年龄结构示意图，读图，完成下列各题。

如图所示，图1表示细胞分裂的不同时期染色体数与核DNA分子数比例的变化关系；图2 表示某动物处于细胞分裂不同时期的图象．请据图回答下列问题：

    Jeff is fifteen now, but he's still in Grade One. He likes playing1, he often plays it with his friends, but he does not like to use his head. He does not listen to his2in class, so he can not do his homework. His teachers don't like him. They tell his parents3it, and they do not know what to do.

    It's Sunday today. Jeff gets up4in the morning. After breakfast, his mother tells him to do his homework. He goes to his bedroom.5his mother is busy with her housework, Jeff goes out with a ball. Now it's time for lunch, but she can't 6Jeff.

    Later he comes back. His parents look very angry, but say7. After lunch, Jeff wants to go out again. His father stops him and8, “Is your homework over?''

    “No,” answers the boy, “I can't do it.” His father pulls(拉、拽)him by the9and says, “Where is your ear?” “Oh，dear!" Jeff calls out, “It's in your10.”