一个分数的分子是最小的奇质数，分母是最小的偶合数，这个分数就是____。

现存较早的中共“一大”党纲收藏在美国哥伦比亚大学图书馆，而且是用英文写的。原来，“一大”代表陈公博后来到美国读书，用英文写了博士论文，“一大”党纲作为附件置于论文之后。针对这份英文“党纲”的可信性，主要有以下意见 （  ）

①具有珍贵的史料价值，因为是“一大”的当事人所记，可作为党史研究的重要史料  ②不具备史料价值，因为英文写的党纲是为论文服务的  ③去伪存真，考证无误后，可作为史料使用。下列判断正确的是

根据短文理解，选择正确答案填空。 

    Jim is a junior high school student. He gets up 16:30 every morning. His home is near his school. He 2home after breakfast. He goes to school on foot. This is good for his 3. He has four lessons in the morning. He has lunch at home. After lunch he goes to school again. In the afternoon, Jim has lessons . He likes English and PE lessons. He has PE lessons on Tuesday and Friday. He is good at4football and basketball. He is also good at the high jump. His PE teacher likes5 very much. He often plays football with his classmates after school.