二次函数y=﹣x²+2x+4的最大值为（　　）

    Every school has its own rules. How many1are there in your school？ At some schools, the students 2 to wear uniforms on school days. But many students don't like to wear uniforms. They think the uniforms are the ugliest 3 in the world. But the school don't allow students to wear 4 own clothes at school. So some students draw cartoons or some famous singers on their 5. They think it is very6that everyone wears the same. It is very unfair(不公平的） that teachers and students are wearing7. But most of the students 8the rules. What do you think 9 it? Do you 10your school uniforms?

下列诗词反映了历史事件，按照时间顺序排列正确的是（    ）

①“忆昔开元全盛日，小邑犹藏万家室。”  ②“秦王扫六合，虎视何雄哉！” ③“故垒西边，人道是，三国周郎赤壁。” ④“一代天骄，成吉思汗，只识弯弓射大雕。”