什么是软件测试？
参考答案：
使用人工和自动手段来运行或测试某个系统的过程，其目的在于检验它是否满足规定的需求或是弄清预期结果与实际结果之间的差异
In how many arrangements can a teacher seat 3 girls and 3 boys in a row of 6 seats if the boys are to have the first, third, and fifth seats ？（）
A.6
B.9
C.12
D.36
E.720
