先采用选择法，将学生成绩从高到低进行排序，再输入一个学生的成绩，将此成绩按照排序规律插入已排好序的学生成绩数组，最后将排好序的成绩单进行反序存放。-The selection method, students from high to low ranking, enter a student achievement, the results will be sorted into law already sorted array of student achievement, finally w