单选题 有如下程序：
#include＜iostream＞
us ing namespace std;
class Publication{//出版物类
char name[30];
public:
Publication(char *name="未知名称"){
strcpy(this-＞name, name);
}
const char *getName()const{return name;}
virtual const char *getType()const{return"未知类型";}
};
class Book:public Publication{//书类
public:
Book(char *name):Publication(name){}
virtual const char *getType()const{return"书";}
};
void showPublication(Publication &p){
cout＜＜p.getType()＜＜":"＜＜p.getName()＜＜endl;
}
int main(){
Book book("精彩人生");
showPublication(book);
return 0;
}
运行时的输出结果是______。