题1
int a = Convert.ToInt32(Console.ReadLine());
int b = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(a+b);
题2
int a = Convert.ToInt32(Console.ReadLine());
int b = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(a/b);
题3
除了4 都正确
题4
A
题5
A