2010中国网球公赛女单冠军是（）。

以下程序的执行结果是______。
#include ＜iostream＞
using namespace std;
class base

public:
virtual void who() cout＜＜"Base Class"＜＜endl;
;
class Derived1: public Base

public:
virtual void who() cout＜＜"Derived1 Class"＜＜endl;
;
class derived2: public Base

public:
virtual void who() cout＜＜"Derived2 Class"＜＜endl;
;
int main(int argc, char *argv[ ])

base obj1,*p;
derived1 obj2;
derived2 obj3;
p=&obj1; p-＞who();
p=&obj2; p-＞who();
p=&obj3; p-＞who();
return 0;