[单项选择]有如下程序:
#nclude ＜iostream＞
using namespace std;
class Base public:
void fun1（　） cout ＜＜ "Base/n";
virtual void fun2（　） cout ＜＜ "Base/n";
;
class Derived: public Base public:
void fun1（　） cout ＜＜ "Derived/n";
void fun2（　） cout ＜＜ "Derived/n"; void f(Base& b) B. fun1（　）; B. fun2（　）;
int main（　）Derived obj;
f(obj);
return 0;

A. Base
B. Base
C. Derived
D. Derived

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[单项选择]有如下程序:#nclude ＜iostream＞using namespace std;class Base{ public:void fun1（　） {cout ＜＜ "Base/n"; }virtual void fun2（　） {cout ＜＜ "Base/n"; }};class Derived: public Base{ public:void fun1（　） {cout ＜＜ "Derived/n"; }void fun2（　） {cout ＜＜ "Derived/n"; }} void f(Base& b) { B. fun1（　）; B. fun2（　）; }int main（　）{Derived obj;f(obj);return 0;}
A. Base Base
B. Base Derived
C. Derived Base
D. Derived Derived

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[单项选择]有如下程序:
#include ＜iostream＞
using namespace std;
class AA
int n;
public:
AA(int k):n(k)
int get（　）return n;
int get（　）const return n+1;
;
int main（　） AAa(5);
const AA b(6);
cout＜＜
A. 执行后的输出结果是( )。 55B. 57C. 75D. 77

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