有如下程序: #include using namespace std; class Book{ public: Book(char*t=””){strcpy(title,t);} private: char title[40]; }; class Novel:public Book{ public: Novel(char *t=””):Book(t){} char*Category()const{return”文学”;) }; int main(){ Book *pb; pb=new Novel(); cout$amp Category(); return 0; } 若程序运行时输出结果是“文学”,则划线处缺失的语句是