The subjects are 55 students from a class in Grade Three, 115 students from a key class and an ordinary class in Grade Two, and 132 students from a key class and an ordinary class in Grade One.

• 研究对象包括高中三年级一个班55名学生、高中二年级一个重点班级和一个普通班级共115名学生以及高中一年级一个重点班级和一个普通班级共132名学生。