问:……我是一名高二男生,学习成绩还不错。可最近不知怎么了,我上课时经常有昏昏欲睡的感觉,听课时注意力无法集中;当老师提出问题请大家思考时,我总是理不出思路,大脑似乎被一团乱麻堵塞了一样;晚上做作业时,也总是弄不清解题方法,学习效率非常低……我想了很多办法似乎都没什么用。后来爸爸带我去医院检查,也没有查出任何身体方面的毛病,我真不知道自己到底是怎么了? ——深圳市高级中学急需帮助的阿成 Q: ... I am a sophomore boy with good grades. But I don’t know how to do it recently. I often feel drowsy when I’m in class. I can’t concentrate when I’m in class; when the teacher asks questions and asks people to think, I always can’t figure out the way the brain seems to be blocked by a mess. The same; at night when doing homework, I still can’t always figure out the problem-solving method. The efficiency of learning is very low... I think many ways seem to be useless. Later, Dad took me to the hospital for examination, but also found no physical problems. I really do not know what happened to me in the end? - Acheng, a senior high school in Shenzhen, in need of help