C

    In the United States, headmasters and teachers discipline (惩罚) students in several ways. The teacher often writes to or calls the students' parents. Sometimes students have to stay at school for one hour. If a student behaves very badly, the headmaster can stop the student having classes. The student can't come to school for one, two or three days. Mr. Lazarus, the headmaster of a middle school in Ohio, did not like to do so. When he didn't let the students come to school, they were happy. “A three-day holiday!” they thought.

    One day, a boy was in Mr. Lazarus' office. The boy was not behaving well in class. Mr. Lazarus telephoned the boy's parents. “If you come to school with your son, I won't stop him having classes,＂he said. The boy's father came to school and went with his son to every class. Other students looked at the boy and his father. The boy was embarrassed. After that he behaved better. And, of course, other students behaved better, too.

    Now headmasters all over the USA are trying Mr. Lazarus's idea. They too, think that students behave better when parents come to school.

2016年3月《成都市温江区进城务工人员随迁子女接受义务教育工作实施细则》发布，其中规定在收费标准、评优奖励、入团人队等方面，外来务工子女与本地学生一视同仁。这一规定（    ）

①促进了教育公平                      ②保障了公民受教育的权利

③落实了科学发展观的要求        ④体现了以教育发展为中心的基本路线

下列各物质属于电解质的是（　　）

①NaOH②BaSO₄③Cu④蔗糖⑤CO₂．

已知f（x）=Asin（ωx+φ），（A＞0，ω＞0，0＜φ＜π）的图象的一部分如图所示，则f（x）解析式是（　　）