定期以班级为单位组织一些户外活动，如踏青，登山，参观博物馆等。
Organize regularly outdoor activities such as Hiking, mountain climbing, visiting museums and so on .
由高一高二各班同学以班级为单位所组成的班级和合唱团都踊跃参与其中。
Students from Grade 10 and Grade 11 join the competition in the units of a class choirs.
方法：从青海省七所高校中随机选择在校大学生为对象，以班级为单位，采用问卷调查。
METHODS: College students, randomly selected from 7 universities of Qinghai Province, were investigated with questionnaire taking a class as a unit.
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