菁灵姐姐:我已经是初二的学生了,从小学到现在,学习成绩总是中等偏下。爸爸说我笨,老师说我不开窍。最近看到杂志上说,人的智力发展关键期在四五岁,这是不是说我的脑袋彻底没戏了?如果是这样的话,我是否应该早点弃学干点粗活算了?林平 Jing Jing Sister: I am already a student of the second grade. From elementary school to the present, my academic performance is always lower. Dad said I was stupid, and the teacher said I didn’t open it. Recently I saw the magazine saying that the key period for the development of human intelligence is four or five years old. Does this mean that my head is completely out of play? If that is the case, should I abandon the school for a bit prematurely? Lin Ping