构思巧妙——书包主人不出场,设置书包与课本的矛盾冲突——表达方式创新。四种课本名称很有个性,其表述再现了各自学科的内容;其共性鲜明——书包主人太忙! Ingenious ideas - schoolbag owners do not appear, set the contradiction between schoolbags and textbooks - the expression of innovation. The names of the four types of textbooks are very personal, and their representations reproduce the contents of their respective disciplines; their commonalities are clear-the schoolbag owner is too busy!