写一个程序来帮小孩子练习数学，包含以下功能：【1】检查学号（由两位字母和四位数字组成）；【2】进行测试：1.程序随机出10道两位数四则运算题目，开始计时。2.考试结束后将得分、所用时间和正确答案打印在屏幕上，并存入record.txt。【3】查询分数：从record.txt中读取分数信息，并打印在屏幕上。-Write a program to help children practice math, contains the following features: [1] check student number (by two letters and four numbers)　[2] for testing: 1 out of 10 two-digit random program four computing topics, start timing. 2 after the end of the test scores, the time and the correct answer is printed on the screen and into the record.txt. [3] inquiry Score: Information from record.txt in reading scores, and printed on the screen.