题目

根据材料内容选择最佳答案。Nick is my good friend from England. Now let me tell you something(一些事情)about him. Nick is a student and he is thirteen years old.His family are in Beijing now.His father,Mr Brown,is a manager in a hotel. His mother,Mrs Brown, is an English teachers at his school. Nick has a sister. Her name is Kate. Now they study in the same school.Look!This is a picture of their school. It is very big. There is a tall building with 23 classrooms in the middle of the school.The library is behind the tall building. The sports hall is next to the library. A playgr16．直线l经过两点（1，$\sqrt{3}$），B（-2，2$\sqrt{3}$），则直线l的倾斜角为（　　）A．$\frac{π}{6}$B．$\frac{π}{3}$C．$\frac{2π}{3}$D．$\frac{5π}{6}$