关于青春期的叙述错误的是()
若以F1(﹣3,0),F2(3,0)为焦点的双曲线过点(2,1),则该双曲线的标准方程为____
Being happy is a skill that can be learned like a foreign language, and one way to ______ ourselves to be happy is to write down the little things that cheer us up each day.