A.定义一个学生类，包含如下信息：学生基本信息（年龄、性别、籍贯、民族、学历）；学生成绩（多科成绩）；学生联系方式（家庭住址、手机、座机）；各个信息有相应的赋值/显示方法； -A. define a category of students, including the following information: the students the basic information (age, sex, place of origin, ethnicity, education)