单项选择题

有如下程序： #include #include using namespace std; class Animal{ public: virtual string GetType() const { return "Animal"; } virtual string GetVoice() const { return "Voice"; } }; class Dog:public Animal{ public: string GetType() const { return "Dog"; } string GetVoice() const { return "Woof"; } }; class Cat:public Animal{ public: string GetType() const { return "Cat"; } string GetVoice() const { return "Miaow"; } }; void Type(Animal& a) { cout<

A．DogspeakVoice-CatspeakVoice
B．DogspeakWoof-CatspeakMiaow
C．AnimalspeakVoice-AnimalspeakVoice
D．AnimalspeakWoof-AnimalspeakMiaow

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