从 student 表中查询学生姓名、年龄和成绩，结果按照年龄降序排序，年龄相同的按照成绩升序排序，下面 SQL 语句正确的是：CD A . select name , age , score from student order by age , score asc ; B . select name age , score from student order by 1 desc ,2; C . select name , age , score from student order by age desc , score ; D. select name , age , score from student order by 2 desc ,3 asc ;