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Code
class Program
{
    static void Main(string[] args)
     {
         Sample1.M1(new OrdinaryPeople("ZhangSan"));
         Sample1.M1(new Superman("Hancock"));
         Console.Read();
     }
}
class Sample1
{
    public static void M1(Person p)
     {
         p.Introdce();
     }
}
class Person
{
    protected string mName;
    public Person(string pName)
     {
        this.mName = pName;
     }
    public virtual void Introdce()
     {
         Console.WriteLine("Hello,I am " + this.mName);
     }
}
class OrdinaryPeople : Person
{
    public OrdinaryPeople(string pName)
         : base(pName)
     {
     }
    public new void Introdce()
     {
         Console.WriteLine("Hello,I am an ordinary person," + this.mName);
     }
}
class Superman : Person
{
    public Superman(string pName)
         : base(pName)
     {
     }
    public new void Introdce()
   &


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