Mr. King works very long hours every day. He usually gets up at 5:30. He brushes his teeth quickly and goes to his workplace (工作地点). Then he runs with some kids. After that he takes a shower. He eats his breakfast at 7:00. His work starts at 8:10. He is good at math and many boys and girls learn math from him. All the kids like him very much. He often talks or plays games with the kids. He usually goes to bed after 22:00. He is often very tired but he likes his job and loves the kids. He doesn’t work on weekends. Mr. King likes reading at home on weekends. Sometimes some kids’ parents come to his home to talk about their kids. When Monday comes, Mr. King gets busy again

已知点A（ $\frac{\sqrt{3}}{2}$ ， $\frac{1}{2}$ ），将OA绕坐标原点O逆时针旋转 $\frac{\pi }{2}$ 至OB，则点B的坐标为（  ）

脊椎动物的进化历程是（　　）

十二届人大会议期间，共收到全国人大代表和各地群众提案、建议、意见等共计2000多件，充分体现了人民群众参政议政的热情。这说明（  ）
①人民当家作主                                             ②我国一切权力属于人民 
③我国每个公民都能直接行使国家权力     ④人民代表大会制度是我国的根本制度