建立一个班级下拉式列表，列表项中有2004(1)班，2004(2)班，2004(3)班和2004(4)班。当点击某个选项时，将其成绩单显示在文本区中。-Establish a class drop-down list, list items have 2004 (1) class, 2004 (2) classes, 2004 (3) classes and 2004 (4) classes. When you click an option, which is displayed in the