A:鲁迅,原名周树人,我国伟大的文学家,代表作有散文集《朝花夕拾》,诗集《野草》,小说集《呐喊》《彷徨》,我们学过《藤野先生》就是选自《呐喊》。
B:《龟虽寿》的作者是曹操,《梁甫行》的作者是曹植,与曹丕合称为“三曹”,他们是一家人,在文坛上声望极高。
C:《记承天寺夜游》的作者是苏轼,字子瞻,号东坡居士,北宋文学家。与其父苏洵,弟弟苏辙合称为“三苏”,同在“唐宋八大家”之列。
D:《三峡》作者郦道元,北魏地理学家,著有《水经注》,是我国古代的地理学著作。
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This is a picture of Mr. Li's family. The man in the middle is Mr. Li. The woman is Mr. Li's wife. They have two sons. The child behind Mr.Li is Li Lei. He's thirteen. The other in front of Mrs. Li is Li Ming. He is eleven. Li Lei and Li Ming are in the same school, but not in the same grade. Li Lei is in Grade Two. Li Ming is in Grade One. They are good students.
(Ⅰ)试确定图中实数a与b的值;
(Ⅱ)规定等级D为“不合格”,其他等级为“合格”,以事件发生的频率作为相应事件发生的概率,若从甲、乙两校“合格”的学生中各选1名学生,求甲校学生成绩高于乙校学生成绩的概率.